I have the same exact problem.
When I try to burn the FLASH_CRYPT_CNT I get:
Value mask for efuse FLASH_CRYPT_CNT is 0xff. Value 0x1ff is too large.

Is there anything I can do to make the chip work again or it is gone?

Thank you

-> Although, there is no other modification in boot loader, while there might be possibility of espefuse.py burn_efuse command used after getting "flash read error,1000". Which other efuses do you think you might have burned? FLASH_CRYPT_CNT? No,I have not burned any other efuses. I was trying to b...