ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful configuration files and control them remotely through Home Automation systems.

Recent versions of Home Assistant with ZHA can do over the air (OTA) updates of your zigbee IKEA and LEDVANCE devices.

Other manufactures could be supported too if they published their firmwares publically!

I do know, specifically for IKEA, recent firmware updates have greatly improved their stability and performance.