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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 GQ-4X AT29C020 Top Boot Sector won't unprotect.		  New Topic  Reply to Topic
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petedcurtis

USA
2 Posts
Posted - 06/08/2013 :  02:40:48  Show Profile  Reply with Quote
Hi, Trying to re-program AT29C020. Get good ID. Do an Erase, still get not blank. In Unlock /Lock did a All sector read and it tells me the Top Boot sector is protected. Do an All sector unprotect, but it remains protected. Wrote FF but top sector is protected so no change. The Single sector commands are greyed out. How can I unprotect the top boot sector?
Peter C.
Reply #1

ZLM

2945 Posts
Posted - 06/09/2013 :  22:31:31  Show Profile  Reply with Quote
Try to slow down the speed. If it still not works, then you need to find another unprotected AT29C020.
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