PS5 slim EDM-040 BIOS issue

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r2obd

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I have a strange issue where the ps5 processes all options in safe mode but will hang and go black screen with pulsing blue light in normal boot. Have noticed the bios has been removed previously , checking contents looks OK. But wondering if bios can cause this behaviour? I have also changed the retimer as port had been changed before and considered damage but no change. Is it worth trying afresh digital rom got the 69gg southbrifge and 70gg ssd controller. No uart faults by the way.
 
BACKUP current bios before messing with new bios, you have no danger switching around different bios dump(corresponding model of course)
 

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