update 3.8.5

v3.4.4 Fix for new installations with filesystem not initializing

CHANGELOG.md

@@ -5,6 +5,49 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.8.5] 22 September 2026
+
+## Added
+
+- Change webUI message when upgrading to a major version of the firmware, in preparation for the upcoming 3.9.0 release.
+
+## [3.8.4] 4 August 2026
+
+## Fixed
+
+- Allow auto-download and install of firmware versions which are smaller to allow update to the latest 3.9.0-development version.
+
+## [3.8.3] 1 August 2026
+
+## Added
+
+- KM300 at address 0x4A [#3084](https://github.com/emsesp/EMS-ESP32/issues/3084)
+
+## Fixed
+
+- signed value for solarInfuence [#3077](https://github.com/emsesp/EMS-ESP32/issues/3077)
+- set bin file upload limit to 1M again [#3086](https://github.com/emsesp/EMS-ESP32/issues/3086)
+- check arithmetric operations on strings [#3127](https://github.com/emsesp/EMS-ESP32/discussions/3127)
+- prevent system crash during WiFi network discovery on ESP32-S3 hardware [#3128](https://github.com/emsesp/EMS-ESP32/pull/3128)
+- fix setting date/time on Junkers thermostats
+- offset of hpminflowtemp [#3144](https://github.com/emsesp/EMS-ESP32/issues/3144)
+- water circulation command [#3149](https://github.com/emsesp/EMS-ESP32/pull/3149)
+- start scheduler after customEntities, delay scheduler loop after startup, handling of `system/restart` command [#3146](https://github.com/emsesp/EMS-ESP32/issues/3146)
+- possible memory leaks fixed.
+- repeated startup schedules compute value
+- call `system/message` called from scheduler processes compute twice
+- water module SM100/200 as dhw1/dhw2 [#3164](https://github.com/emsesp/EMS-ESP32/issues/3164)
+
+## Changed
+
+- call compute value direct, enlarge TCP stack [#3127](https://github.com/emsesp/EMS-ESP32/discussions/3127)
+- Dewtemperature for Easycontrol calculated by ems-esp [#3135](https://github.com/emsesp/EMS-ESP32/issues/3135)
+- add option for sync thermostat to ntp, allow different time zones [#3148](https://github.com/emsesp/EMS-ESP32/discussions/3148), **defaults to sync**.
+- block too many GET requests [mentioned in #3104](https://github.com/emsesp/EMS-ESP32/issues/3104)
+- set 10 sec timeout for http requests [#3104](https://github.com/emsesp/EMS-ESP32/issues/3104)
+- language code "cs" [#3161](https://github.com/emsesp/EMS-ESP32/issues/3161)
+
+
 ## [3.8.2] 12 May 2026
 
 ## Added
@@ -71,7 +114,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - board profile `CUSTOM` can only be selected in developer mode
 - mqtt sends round values without decimals (`28` instead of `28.0`)
 
-
 ## [3.8.0] 31 December 2025
 
 ## Added

CHANGELOG_LATEST.md

@@ -2,32 +2,3 @@
 
 For more details go to [emsesp.org](https://emsesp.org/).
 
-## [3.8.3]
-
-## Added
-
-- KM300 at address 0x4A [#3084](https://github.com/emsesp/EMS-ESP32/issues/3084)
-
-## Fixed
-
-- signed value for solarInfuence [#3077](https://github.com/emsesp/EMS-ESP32/issues/3077)
-- set bin file upload limit to 1M again [#3086](https://github.com/emsesp/EMS-ESP32/issues/3086)
-- check arithmetric operations on strings [#3127](https://github.com/emsesp/EMS-ESP32/discussions/3127)
-- prevent system crash during WiFi network discovery on ESP32-S3 hardware [#3128](https://github.com/emsesp/EMS-ESP32/pull/3128)
-- fix setting date/time on Junkers thermostats
-- offset of hpminflowtemp [#3144](https://github.com/emsesp/EMS-ESP32/issues/3144)
-- water circulation command [#3149](https://github.com/emsesp/EMS-ESP32/pull/3149)
-- start scheduler after customEntities, delay scheduler loop after startup, handling of `system/restart` command [#3146](https://github.com/emsesp/EMS-ESP32/issues/3146)
-- possible memory leaks fixed.
-- repeated startup schedules compute value
-- call `system/message` called from scheduler processes compute twice
-- water module SM100/200 as dhw1/dhw2 [#3164](https://github.com/emsesp/EMS-ESP32/issues/3164)
-
-## Changed
-
-- call compute value direct, enlarge TCP stack [#3127](https://github.com/emsesp/EMS-ESP32/discussions/3127)
-- Dewtemperature for Easycontrol calculated by ems-esp [#3135](https://github.com/emsesp/EMS-ESP32/issues/3135)
-- add option for sync thermostat to ntp, allow different time zones [#3148](https://github.com/emsesp/EMS-ESP32/discussions/3148), **defaults to sync**.
-- block too many GET requests [mentioned in #3104](https://github.com/emsesp/EMS-ESP32/issues/3104)
-- set 10 sec timeout for http requests [#3104](https://github.com/emsesp/EMS-ESP32/issues/3104)
-- language code "cs" [#3161](https://github.com/emsesp/EMS-ESP32/issues/3161)

interface/package.json

@@ -52,8 +52,8 @@
     "@preact/compat": "^18.3.2",
     "@preact/preset-vite": "^2.10.5",
     "@trivago/prettier-plugin-sort-imports": "^6.0.2",
-    "@types/node": "^25.9.5",
-    "@types/react": "^19.2.17",
+    "@types/node": "^25.7.0",
+    "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "axe-core": "^4.12.1",
     "concurrently": "^9.2.4",
@@ -61,9 +61,9 @@
     "eslint-config-prettier": "^10.1.8",
     "prettier": "^3.9.5",
     "rollup-plugin-visualizer": "^7.0.1",
-    "terser": "^5.49.0",
-    "typescript-eslint": "^8.63.0",
-    "vite": "^8.1.4",
+    "terser": "^5.47.1",
+    "typescript-eslint": "^8.59.3",
+    "vite": "^8.0.12",
     "vite-plugin-imagemin": "^0.6.1",
     "vite-tsconfig-paths": "^6.1.1"
   },

interface/src/app/status/Version.tsx

@@ -316,16 +316,12 @@ const InstallDialog = memo(
             )}
           </Typography>
           {upgradeImportantMessageType === 2 && LL.UPGRADE_IMPORTANT_MESSAGES_2()}
-          {upgradeImportantMessageType === 1 && (
-            <>
-              {LL.UPGRADE_IMPORTANT_MESSAGES_1()}
+          {upgradeImportantMessageType === 1 && LL.UPGRADE_IMPORTANT_MESSAGES_1()}
               <Typography sx={{ mt: 2 }}>
                 <Link to="/settings/downloadUpload" style={{ color: 'lightblue' }}>
                   {LL.DOWNLOAD_SYSTEM_BACKUP()}
                 </Link>
               </Typography>
-            </>
-          )}
           <Typography sx={{ mt: 2 }}>
             <Link
               to="https://docs.emsesp.org/FAQ#upgrading-the-firmware"

interface/src/i18n/cs/index.ts

@@ -363,7 +363,7 @@ const cs: Translation = {
   ONLINE_HELP: 'online nápověda',
   UPGRADE_IMPORTANT_MESSAGES: 'Aktualizovat důležité zprávy',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Tato aktualizace vyžaduje obnovení továrního nastavení. Ujistěte se, že nejprve stáhnete systémovou zálohu před pokračováním a poté nahrajte tento soubor po instalaci nové verze.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Aktualizujete se na novou hlavní verzi. Ujistěte se, že jste přečetli ChangeLog pro jakékoliv závažné změny.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Aktualizujete se na novou major verzi. Je vhodné nejprve vytvořit systémovou zálohu. Také zkontrolujte online nápovědu pro jakékoliv závažné změny.',
   WARNING_SYSTEM_BACKUP: 'Toto vytvoří zálohu vašich celých systémových konfigurací a nastavení. Všechna hesla budou v zálohovém souboru čitelná. Buďte opatrní při sdílení! Opravdu chcete pokračovat?'
 
 };

interface/src/i18n/de/index.ts

@@ -363,7 +363,7 @@ const de: Translation = {
   ONLINE_HELP: 'Online-Hilfe',
   UPGRADE_IMPORTANT_MESSAGES: 'Wichtige Nachrichten aktualisieren',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Für diese Aktualisierung ist ein Werksreset erforderlich. Stellen Sie sicher, dass Sie zuerst eine Systemsicherung herunterladen, bevor Sie fortfahren, und laden Sie diese Datei dann nach der Installation der neuen Version hoch.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Sie aktualisieren auf eine neue Hauptversion. Stellen Sie sicher, dass Sie den ChangeLog für alle wichtigen Änderungen gelesen haben.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Sie aktualisieren auf eine neue major Version. Es ist ratsam, zuerst eine Systemsicherung zu erstellen. Überprüfen Sie auch die Online-Hilfe für eventuelle wichtige Änderungen.',
   WARNING_SYSTEM_BACKUP: 'Dies wird eine Sicherung Ihrer vollständigen Systemkonfiguration und Einstellungen erstellen. Alle Passwörter werden in dieser Sicherungsdatei lesbar sein. Seien Sie vorsichtig beim Teilen! Möchten Sie fortfahren?'
 
 };

interface/src/i18n/en/index.ts

@@ -363,7 +363,7 @@ const en: Translation = {
   ONLINE_HELP: 'online help',
   UPGRADE_IMPORTANT_MESSAGES: 'Upgrade Important Messages',
   UPGRADE_IMPORTANT_MESSAGES_1: 'This upgrade requires a factory reset. Make sure you first download a System Backup before continuing, and then upload this file after the new version is installed.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'You are upgrading to a new major version. Make sure you have read the ChangeLog for any breaking changes.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'You are upgrading to a new major version. It is advisable to make a system backup first. Also check the online help for any breaking changes.',
   WARNING_SYSTEM_BACKUP: 'This will create a backup of your full system configuration and settings. All passwords will be readable in the backup file. Be careful with sharing! Do you want to continue?'
 
 };

interface/src/i18n/fr/index.ts

@@ -363,7 +363,7 @@ const fr: Translation = {
   ONLINE_HELP: 'aide en ligne',
   UPGRADE_IMPORTANT_MESSAGES: 'Mettre à jour les messages importants',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Cette mise à jour nécessite une réinitialisation de fabrique. Assurez-vous de télécharger une sauvegarde système avant de continuer, et de la charger après l\'installation de la nouvelle version.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Vous mettez à jour vers une nouvelle version majeure. Assurez-vous de lire le ChangeLog pour tout changement important.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Vous mettez à jour vers une nouvelle version majeure. Il est recommandé de créer d\'abord une sauvegarde système. Vérifiez également l\'aide en ligne pour les éventuelles modifications importantes.',
   WARNING_SYSTEM_BACKUP: 'Cela créera une sauvegarde de votre configuration et paramètres complets. Tous les mots de passe seront lisibles dans le fichier de sauvegarde. Soyez prudent avec le partage ! Voulez-vous continuer ?'
 
 };

interface/src/i18n/it/index.ts

@@ -363,7 +363,7 @@ const it: Translation = {
   ONLINE_HELP: 'aiuto online',
   UPGRADE_IMPORTANT_MESSAGES: 'Aggiorna Messaggi Importanti',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Questa aggiornamento richiede un ripristino di fabbrica. Assicurati di prima scaricare un backup del sistema prima di continuare, e poi caricare questo file dopo l\'installazione della nuova versione.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Stai aggiornando a una nuova versione principale. Assicurati di aver letto il ChangeLog per qualsiasi cambiamento importante.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Stai aggiornando a una nuova versione major. È consigliabile prima creare un backup del sistema. Controlla anche l\'aiuto online per eventuali modifiche importanti.',
   WARNING_SYSTEM_BACKUP: 'Questo creerà un backup delle tue configurazioni e impostazioni complete. Tutte le password saranno leggibili nel file di backup. Sei sicuro di voler continuare?'
 
 };

interface/src/i18n/nl/index.ts

@@ -363,7 +363,7 @@ const nl: Translation = {
   ONLINE_HELP: 'online help',
   UPGRADE_IMPORTANT_MESSAGES: 'Upgrade Belangrijke Berichten',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Deze upgrade vereist een fabrieksinstelling. Zorg ervoor dat u eerst een Systeem Backup download voordat u doorgaat, en upload deze file na de installatie van de nieuwe versie.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'U updatet naar een nieuwe grote versie. Zorg ervoor dat u de ChangeLog hebt gelezen voor alle brekende wijzigingen.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'U updatet naar een nieuwe major versie. Het is raadzaam om eerst een systeem backup te maken. Controleer ook de online help voor eventuele brekende wijzigingen.',
   WARNING_SYSTEM_BACKUP: 'Dit zal een back-up van uw volledige systeemconfiguratie en instellingen maken. Alle wachtwoorden zijn leesbaar in het back-upbestand. Wees voorzichtig bij delen! Wilt u doorgaan?'
 
 };

interface/src/i18n/no/index.ts

@@ -363,7 +363,7 @@ const no: Translation = {
   ONLINE_HELP: 'online hjelp',
   UPGRADE_IMPORTANT_MESSAGES: 'Oppdater viktige meldinger',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Denne oppdateringen krever en fabriksinstilling. Sørg for at du først lastet ned en System Backup før du fortsetter, og last denne filen etter at den nye versjonen er installert.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Du oppdaterer til en ny hovedversjon. Sørg for at du har lest ChangeLog for eventuelle bruddende endringer.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Du oppdaterer til en ny major versjon. Det er anbefalt å først lage en systembackup. Kontroller også onlinehjelp for eventuelle viktige endringer.',
   WARNING_SYSTEM_BACKUP: 'Dette vil lage en sikkerhetskopi av din fullstendige systemkonfigurasjon og innstillinger. Alle passord vil være lesbare i sikkerhetskopien. Vær forsiktig med deling! Vil du fortsette?'
 
 };

interface/src/i18n/pl/index.ts

@@ -363,7 +363,7 @@ const pl: BaseTranslation = {
   ONLINE_HELP: 'pomoc online',
   UPGRADE_IMPORTANT_MESSAGES: 'Aktualizuj ważne wiadomości',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Ta aktualizacja wymaga resetu fabrycznego. Upewnij się, że najpierw pobierzesz kopię zapasową systemu przed kontynuowaniem, a następnie przesuń tę plik po zainstalowaniu nowej wersji.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Aktualizujesz się do nowej głównej wersji. Upewnij się, że przeczytałeś ChangeLog dla wszelkich istotnych zmian.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Aktualizujesz się na nową major wersję. Jest to zalecane, aby najpierw utworzyć kopię zapasową systemu. Sprawdź również online pomoc dla ewentualnych istotnych zmian.',
   WARNING_SYSTEM_BACKUP: 'To spowoduje utworzenie kopii zapasowej całej konfiguracji i ustawień systemu. Wszystkie hasła będą widoczne w pliku kopii zapasowej. Bądź ostrożny przy udostępnianiu! Chcesz kontynuować?'
 
 };

interface/src/i18n/sk/index.ts

@@ -363,7 +363,7 @@ const sk: Translation = {
   ONLINE_HELP: 'online pomoc',
   UPGRADE_IMPORTANT_MESSAGES: 'Aktualizovať dôležité správy',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Táto aktualizácia vyžaduje reštart základných nastavení. Uistite sa, že najprv stiahnete systémovú zálohu pred pokračovaním, a potom nahrajte tento súbor po instalácii novej verzie.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Aktualizujete sa na novú hlavnú verziu. Uistite sa, že ste prečítali ChangeLog pre akékoľvek dôležité zmeny.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Aktualizujete sa na novú major verziu. Je vhodné najprv vytvoriť systémovú zálohu. Taktiež skontrolujte online nápovľu pre akékoľvek dôležité zmeny.',
   WARNING_SYSTEM_BACKUP: 'Toto vytvorí zálohu všetkých vašich celých systémových konfigurácií a nastavení. Všetky hesla budú čitateľné v zálohovom súbore. Buďte opatrní pri zdieľaní! Chcete pokračovať?'
 
 };

interface/src/i18n/sv/index.ts

@@ -363,7 +363,7 @@ const sv: Translation = {
   ONLINE_HELP: 'online hjälp',
   UPGRADE_IMPORTANT_MESSAGES: 'Uppdatera viktiga meddelanden',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Denna uppdatering kräver en fabriksåterställning. Se till att du först laddar ned en System Backup innan du fortsätter, och ladda upp denna fil efter att den nya versionen är installerad.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Du uppdaterar till en ny huvudversion. Se till att du har läst ChangeLog för eventuella brkande ändringar.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Du uppdaterar till en ny major version. Det är rekommenderat att först skapa en systembackup. Kontrollera också onlinehjälpen för eventuella viktiga ändringar.',
   WARNING_SYSTEM_BACKUP: 'Detta kommer att skapa en säkerhetskopia av din fullständiga systemkonfiguration och inställningar. Alla lösenord kommer att vara läsbara i säkerhetskopien. Var försiktig med att dela! Vill du fortsätta?'
 
 };

interface/src/i18n/tr/index.ts

@@ -363,7 +363,7 @@ const tr: Translation = {
   ONLINE_HELP: 'online yardım',
   UPGRADE_IMPORTANT_MESSAGES: 'Önemli Mesajları Güncelle',
   UPGRADE_IMPORTANT_MESSAGES_1: 'Bu güncelleme továrnı ayarlarını gerektirir. Yapılandırmanızı ve ayarlarınızı önce yedekleyin ve ardından yeni sürüm yüklendikten sonra yükleyin.',
-  UPGRADE_IMPORTANT_MESSAGES_2: 'Yeni bir büyük sürüme yükselteceksiniz. Değişiklikleri ChangeLogı okuduğunuzdan emin olun.',
+  UPGRADE_IMPORTANT_MESSAGES_2: 'Yeni bir major sürüme güncelleme yapıyorsunuz. Sistem yedeklemesi yapmanız önerilir. Ayrıca online yardımı kontrol ederek önemli değişiklikleri gözden geçirin.',
   WARNING_SYSTEM_BACKUP: 'Bu, sistem yapılandırmanızı ve ayarlarınızın bir yedeklemesi oluşturacaktır. Tüm şifreler yedekleme dosyasında okunabilir olacaktır. Paylaşırken dikkatli olun! Devam etmek istediğinize emin misiniz?'
 
 };

mock-api/package.json

@@ -2,6 +2,7 @@
   "name": "mock-api",
   "version": "3.8.2",
   "description": "mock api for EMS-ESP",
+  "type": "module",
   "author": "proddy, emsesp.org",
   "license": "MIT",
   "scripts": {

mock-api/restServer.ts

@@ -302,10 +302,10 @@ function updateMask(entity: any, de: any, dd: any) {
       const old_custom_name = dd.nodes[dd_objIndex].cn;
       console.log(
         'comparing names, old (' +
-          old_custom_name +
-          ') with new (' +
-          new_custom_name +
-          ')'
+        old_custom_name +
+        ') with new (' +
+        new_custom_name +
+        ')'
       );
       if (old_custom_name !== new_custom_name) {
         changed = true;
@@ -395,23 +395,32 @@ function custom_support() {
 }
 
 // called by Action endpoint upgradeImportantMessages
+// 0 is do nothing
+// 1 is a special upgrade and needs an export->factory reset->import
+// 2 is a major upgrade
 function upgradeImportantMessages(version: string) {
-  // 0 is do nothing
-  // 1 means 3.9 and factory reset required
-  // 2 means a major version upgrade
   let upgradeImportantMessageType_n = 0;
 
-  // see if its a filename with a .bin extension
-  if (version.endsWith('.bin')) {
-    upgradeImportantMessageType_n = 1; // 1 means 3.9 and factory reset required
-  } else if (version.endsWith('.md')) {
-    upgradeImportantMessageType_n = 0;
+  // check file extensions first
+  if (version.endsWith('.md5') || version.endsWith('.json')) {
+    upgradeImportantMessageType_n = 0; // digest / backup restore: no upgrade warning
+  } else if (version.endsWith('.bin')) {
+    // extract the version number from the filename and if its going from 3.8.x to 3.9.x, then set upgradeImportantMessageType_n to 1
+    const versionNumber = version.split('.');
+    if (versionNumber[0] === '3' && versionNumber[1] === '8') {
+      upgradeImportantMessageType_n = 2; // major upgrade
+    }
   } else {
-    // this is a version string like "3.9.0"
-    upgradeImportantMessageType_n = 2;
+    // the parameter is a version string like "3.9.0"
+    upgradeImportantMessageType_n = 2; // major upgrade
   }
 
-  console.log('upgradeImportantMessageType: ' + upgradeImportantMessageType_n);
+  console.log(
+    'upgradeImportantMessageType: version=' +
+    version +
+    ' type=' +
+    upgradeImportantMessageType_n
+  );
   return { upgradeImportantMessageType: upgradeImportantMessageType_n };
 }
 
@@ -424,15 +433,15 @@ function check_upgrade(version: string) {
 
     console.log(
       'Upgrade this version (' +
-        THIS_VERSION +
-        ') to dev (' +
-        dev_version +
-        ') is ' +
-        (DEV_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO') +
-        ' and to stable (' +
-        stable_version +
-        ') is ' +
-        (STABLE_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO')
+      THIS_VERSION +
+      ') to dev (' +
+      dev_version +
+      ') is ' +
+      (DEV_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO') +
+      ' and to stable (' +
+      stable_version +
+      ') is ' +
+      (STABLE_VERSION_IS_UPGRADEABLE ? 'YES' : 'NO')
     );
     data = {
       emsesp_version: THIS_VERSION,

src/core/system.cpp

@@ -954,6 +954,10 @@ void System::network_init() {
 #else
     eth_present_ = ETH.begin(type, phy_addr, mdc, mdio, power, clock_mode);
 #endif
+    // show error if Eth is present but fails to start, so it can be automatically detected by the new installers
+    if (!eth_present_) {
+        LOG_ERROR("Failed to start Ethernet");
+    }
 #endif
 }
 
@@ -3024,18 +3028,24 @@ bool System::uploadFirmwareURL(const char * url) {
         return false; // error
     }
 
+    // the Content-Length from the response header, -1 if the server didn't send one.
     int firmware_size = http.getSize();
+    if (firmware_size <= 0) {
+        LOG_ERROR("Firmware upload failed - unknown size");
+        http.end();
+        return false; // error
+    }
 
-    // check we have a valid size
-    if (firmware_size < 2097152) { // 2MB or greater is required
-        LOG_ERROR("Firmware upload failed - invalid size");
+    // catch a wrong URL early, before streaming. Smallest shipped image is ~1.9MB
+    if (firmware_size < 1677721) { // 1.6MB
+        LOG_ERROR("Firmware upload failed - too small (%d KB)", firmware_size / 1024);
         http.end();
         return false; // error
     }
 
     // check we have enough space for the upload in the ota partition
     if (!Update.begin(firmware_size)) {
-        LOG_ERROR("Firmware upload failed - no space");
+        LOG_ERROR("Firmware upload failed - %s", Update.errorString());
         http.end();
         return false; // error
     }
@@ -3052,7 +3062,7 @@ bool System::uploadFirmwareURL(const char * url) {
 
     // get tcp stream and send it to Updater
     WiFiClient * stream = http.getStreamPtr();
-    if (Update.writeStream(*stream) != firmware_size) {
+    if (Update.writeStream(*stream) != (size_t)firmware_size) {
         LOG_ERROR("Firmware upload failed - size differences");
         http.end();
         EMSESP::system_.systemStatus(SYSTEM_STATUS::SYSTEM_STATUS_ERROR_UPLOAD);

src/emsesp_version.h

@@ -1 +1 @@
-#define EMSESP_APP_VERSION "3.8.3-dev.11"
+#define EMSESP_APP_VERSION "3.8.5"

test/test_api/test_api.h

@@ -588,4 +588,4 @@ void run_tests() {
     RUN_TEST(test_57);
 }
 
-// ---------- END - CUT HERE ----------
+// ---------- END - CUT HERE ----------