i have a modem which i use for testing and i have done many read/write operation on its flash up to now.
And yesterday it started to give ERROR responses to my AT+WOPEN=3 commands. Although it says ERROR, it erases the flash. When i start the application again, i can see that the flash has been erased. I am sure about modem has some data on its flash and AT+WOPEN=0 successfull before i send AT+WOPEN=3. But it responses unexpectly as ERROR although it seems to be successfull.
What can it be the reason?