OKI I managed to flash the phone with full flash from railgun brother now bootcore is prepared to freezing, but freeze cannot take place as phone beeps like "wrong software" and does not go to BFB mode...
I already ticked "replace bcore v22" (which actually tend to replace x75 bootcore with v11), may I flash the bootcore with the one from full flash to get further?
or simpler: how can one repair a beeping phone "wrongly unlocked"?
note that I cannot use PX75 as the phone does not turn on now.