+CME ERROR:551 after sending AT+WOPEN=6,1024


I have several Q2686 modems, all of them with 7.52 Firmware. I need to send AT+WOPEN=6,1024 in order to use DOTA.
The problem is that some of the modems return +CME ERROR:551 after sending this command and I cannot format A&D memory, while others do not have this problem at all.

I have been searching what this Error means and if I´m not wrong it means “Wrong State”.

If someone can help me, it would be really helpful.

For 7.52FW version , I will suggest you to use filesystem for better performance…