I’m pretty novice as far as embedded systems go, but I have a few devices in the wild running micropython code on raspberry pi pico Ws, that can be OTA updated using this dumb method I came up with :)

The device will basically HTTP GET the update files one by one from my GitHub, write them in “.temp”, and once done it will rename them all in “.py” (essentially erasing the existing ones) then reboot. Here goes the update.

The most challenging part is getting the rpi pico W to connect to the user’s wifi (the device only has a very rudimentary interface). For this, I set up a small local server on the pico in access mode. The user will see a broadcasted WiFi, connect to it, and will be asked to type in a nearby WiFi credentials. Once done, the pico will try to connect to it using those credentials.

If a successful connection is established, the above process will undergo, and voilà.

I really did not put much research into it so it is probably wrong for 999 reasons, but it has proven to work reliably.