Did you try to change the value in SR1 and CR1 using WREN and WRR commands?
1. CS# LOW
2. WREN command
3. CS# HIGH
4. CS# LOW
5. WRR command + SR1 value + CR1 value
6. CS# HIGH
Also, please let us know the steps you follow to program and erase flash device.
Thanks and Regards,
I have got the similiar problem. I tried to change the CR1 value.And after that ,the flash device is unaccessible.I can not even read the device ID. The SR1 and CR1 value can not be read out either. Any idea will be appraciate.