Erasing and writing flash chip... Transaction error between offset 0x000af000 and 0x000affff (= 0x000af000 + 4095)!

Looking for another erase function.
Looking for another erase function. 
Looking for another erase function.
Looking for another erase function.
Looking for another erase function.
Looking for another erase function.
No usable erase function left. 
FAILED! 
UH oh. Erase/write failed. Checking if anything has changed.
Apparently at least some data has changed. 
Your flash chip is in an unknown state.