Re: TP-Link Archer MR200
from the 'ip add' output it appears the LTE modem is not being recognized for some reason.
did you by any chance open up the device and remove the LTE card? if so ensure that you insert it again correctly.
if not, there might be some missing modules for some reason. please provide us with the output of 'lsmod' .
Also it would really help if you reboot the device and paste the output of 'logread' afterwards.
either ways, you likely don't need to worry. this is not serious. worse case, by a simple step you can revert back to heinz build.