However, when running: at+cfun=0 or at+cfun=1, it returns with errors as the following:
2022-06-21 10:51:00:757_R:] at+cfun=0
[2022-06-21 10:51:00:757_R:] +CME ERROR: 4
[2022-06-21 10:51:10:241_S:] at+cfun=1
[2022-06-21 10:51:10:303_R:] at+cfun=1
[2022-06-21 10:51:10:303_R:] +CME ERROR: 0
and when running at+cfun?, it returns with 7 and i dont know what 7 means here:
[2022-06-21 10:50:42:892_R:] at+cfun?
[2022-06-21 10:50:42:892_R:] +CFUN: 7
AT commands work in general and the SIM card is correctly inserted as I can read the IMSI, there is no PIN code and the SIM card is no locked.
Thanks for the reply, he mentioned the return of 7 as response of at+cfun? and he said it’s version mismatch or PA abnormal. but what u think the solution for that, is firmware upgrade enough or there’s H/W issue here?
Also have the same issue with AT+CFUN? returning 7 on a RM502-AE. I’ve tried every version of firmware up to the latest R13, but to no avail. It used to return CFUN of 5, now 7 and I can’t get it out of this mode.