I'll look for information about serializing, since it's practically the only optionThe 40021 error shows you have a new part or parts (the ones you replaced) that do not match the numbers on the Main board. DJI matches numbers with specialized software called Repairtool. It can only be used by DJI. However there are services out there that can serialize your drones parts for you for a fee. I will not recommend one tho but they exsist and will work for you. Your only other option is to send it to DJI, They will simply replace the drone tho (expensive!!).
The other errors were caused by the ESC However those could have been triggered by the 40021 error. Get your parts serialized and if the other 2 errors persist then your ESC needs to be replaced.
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