Add option `#define UPGRADE_V8_MIN` to drop support for upgrading before v8.0 (saves 1.3kb)

This option is not enabled by default except for ZBBridge, whose version was always at least v8.0.

CHANGELOG.md

@@ -11,6 +11,7 @@ All notable changes to this project will be documented in this file.
 - Support for multiple WeMo devices by Magic73 (#9208)
 - Fallback NTP server from x.pool.ntp.org if no ntpservers are configured
 - TyuaMcu update 2/3 by Federico Leoni (#10004)
+- Add option `#define UPGRADE_V8_MIN` to drop support for upgrading before v8.0 (saves 1.3kb)
 
 ### Breaking Changed
 - KNX DPT9 (16-bit float) to DPT14 (32-bit float) by Adrian Scillato (#9811, #9888)

tasmota/my_user_config.h

@@ -45,6 +45,7 @@
 #define CFG_HOLDER             4617              // [Reset 1] Change this value (max 32000) to load SECTION1 configuration parameters to flash
                                                  // If following define is disabled it increases configuration corruption detection BUT
                                                  //  it only allows firmware upgrades starting from version 6.6.0.11
+// #define UPGRADE_V8_MIN                           // do not support upgrading from version below 8.0.0
 
 // -- Project -------------------------------------
 #define PROJECT                "tasmota"         // PROJECT is used as the default topic delimiter

tasmota/settings.ino

@@ -1097,6 +1097,7 @@ void SettingsDelta(void)
   if (Settings.version != VERSION) {      // Fix version dependent changes
 
 #ifdef ESP8266
+#ifndef UPGRADE_V8_MIN
     if (Settings.version < 0x07000002) {
       Settings.web_color2[0][0] = Settings.web_color[0][0];
       Settings.web_color2[0][1] = Settings.web_color[0][1];
@@ -1200,6 +1201,7 @@ void SettingsDelta(void)
 //      SettingsUpdateText(SET_FRIENDLYNAME3, Settings.ex_friendlyname[2]);
 //      SettingsUpdateText(SET_FRIENDLYNAME4, Settings.ex_friendlyname[3]);
     }
+#endif // UPGRADE_V8_MIN
     if (Settings.version < 0x08020003) {
       SettingsUpdateText(SET_TEMPLATE_NAME, Settings.user_template_name);
       Settings.zb_channel = 0;      // set channel to zero to force reinit of zigbee parameters

tasmota/tasmota_configurations.h

@@ -458,6 +458,8 @@
 #define USE_DOMOTICZ                             // Enable Domoticz
 #undef USE_HOME_ASSISTANT                        // Disable Home Assistant
 
+#define UPGRADE_V8_MIN                           // do not support upgrading from version below 8.0.0
+
 // -- MQTT - TLS - AWS IoT ------------------------
 #ifdef USE_ZBBRIDGE_TLS                            // Enable TLS for ZbBridge
   #define USE_MQTT_TLS                             // Use TLS for MQTT connection (+34.5k code, +7.0k mem and +4.8k additional during connection handshake)