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Is there anyway to use USB Blaster (with Quartus II Programmer) to unprotect Memory content (all 128 Sectors) for M25P64? M25P64 is connected to EP3C55 through JTAG.
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Not that I know of. Can you not just pull the WP pin high ?
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I'm suspecting that the raw IC have been write protected by the manufacturer. I'm not able to unprotect it with Byte Blaster (on board). The other alternative way i have is to remove IC from the board and use the IC Programmer to erase it.

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