Dear All, How can I restore the 0xFF in the OOB[5]? i understood the oob[5] is the bad block indicator. The YAFFS set accidentally the byte to 0x00 . I want to use JFFS2 but the eraseall command said they are invalid block. I am sure that the block is health . So, I want to force set the oob[5] to oxFF, pls. how can i do? Thank you. Paul