Incorrect temperature readings

[luuk1201]

I've finally gotten around to changing the enclosure, and the first results are looking good: the wifi temperature sensor shows almost the same temperature as the CO2 monitor (also BME280) right next to it. Humidity (1%) and pressure (<2 hPa) are almost identical as well now.

For both sensors, the temperature is still a bit higher than it should be in this room (about a degree), so an option to set a temperature offset would be greatly appreciated

Lastly, I couldn't really find how to update the firmware OTAH, is there a command to do this?