So I have attached an example of switching to a different firmware image manually EM7565 multi image update and image switch.txt (12.0 KB) , its for an EM7565 but the principle and commands are the same as for the 74.
The auto SIM switching does work if faced with known MCC/MNC combinations on the SIM IMSI but operators have a lot of different ones so we cannot take all of them into account as there is no way to find out what they are i.e. AT&T have different MCC/MNC combinations for the standard SIM’s vs cat M1 SIM’s issues to industrial customers.
Regards
Matt