I get Android back on the device... THX

I have a problem after installing Ubuntu touch (16.04) on a redmi note 9 (Xiaomi M2003J15SC).
Installation goes through (UBports recognizes the device as "merlin") and after booting there is no access to the sim card from the device. No sign (strength) of the radio cell, nothing.
What can I do?
Is there a way, if this does not work, to reinstall the Android image?

Thanks a lot!
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