as far as i am aware you cannot use GDFS from another phone as they are unique to each phone and you will end up with a dead phone


with regards to the blinking red LED on infered you could try repairing erom there is a guide on how to do this

Upgrading or repairing the EROM (FOTA) in phones CID 49 or CID 51 with Phone XS - Top Sony Forums

regards

cdazza