fix: migration handler and options flow compatibility

- Add async_migrate_entry for v1 -> v2 config entry migration
- Remove OptionsFlow __init__ that conflicts with HA's config_entry property
- Bump version to 1.6.1

Author: JoaoPedroBelo

CHANGELOG.md

@@ -5,6 +5,13 @@ 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).
 
+## [1.6.1] - 2026-03-04
+
+### Fixed
+
+- **Migration error on upgrade** - Added missing `async_migrate_entry` handler for existing installations upgrading from v1.5.x
+- **Options flow crash** - Fixed `OptionsFlow` constructor conflicting with HA's built-in `config_entry` property
+
 ## [1.6.0] - 2026-03-04
 
 ### Added

custom_components/bmw_wallbox/__init__.py

@@ -27,6 +27,19 @@
 ]
 
 
+async def async_migrate_entry(hass: HomeAssistant, config_entry: ConfigEntry) -> bool:
+    """Migrate old entry to new version."""
+    _LOGGER.debug("Migrating from version %s", config_entry.version)
+
+    if config_entry.version == 1:
+        # Version 2 added scan_interval - no data changes needed,
+        # coordinator falls back to DEFAULT_SCAN_INTERVAL if missing
+        hass.config_entries.async_update_entry(config_entry, version=2)
+
+    _LOGGER.info("Migration to version %s successful", config_entry.version)
+    return True
+
+
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     """Set up BMW Wallbox from a config entry."""
     _LOGGER.debug("Setting up BMW Wallbox integration")

custom_components/bmw_wallbox/config_flow.py

@@ -76,7 +76,7 @@ def async_get_options_flow(
         config_entry: config_entries.ConfigEntry,
     ) -> config_entries.OptionsFlow:
         """Get the options flow for this handler."""
-        return OptionsFlow(config_entry)
+        return OptionsFlow()
 
     async def async_step_user(
         self, user_input: dict[str, Any] | None = None
@@ -123,10 +123,6 @@ class InvalidSSLKey(HomeAssistantError):
 class OptionsFlow(config_entries.OptionsFlow):
     """Handle options flow for BMW Wallbox."""
 
-    def __init__(self, config_entry: config_entries.ConfigEntry) -> None:
-        """Initialize options flow."""
-        self.config_entry = config_entry
-
     async def async_step_init(
         self, user_input: dict[str, Any] | None = None
     ) -> FlowResult:

custom_components/bmw_wallbox/manifest.json

@@ -11,5 +11,5 @@
   "requirements": [
     "ocpp>=0.20.0"
   ],
-  "version": "1.6.0"
+  "version": "1.6.1"
 }