AM29F010
AM29F010 (unlike e.g. AT29C010) hasn't a permanent lock. All protections are set- and resettable by a programmer. However, I don't exactly understand your observations. Any programming operation results, including device failure, not recognizing the device, whatsoever, are directly indicated by the ALL11 software. It may be the case, that you simply don't use the programmer correctly or it's defective.
However, you said, the device show empty. ALL11 must at least indicate a programming or verify error!?