Downgrade BC66 module

IoT Modules
1

Hello,

i have two BC66 module with different firmware version. The first one with BC66NBR01A11 is working properly with M2M SIM telefonica carrier. But the other one version BC66NBR03A03 is working initially but few sends later, the modem cannot connect to APN. It solves replacing de SIM with other one and works again. But if I put the SIM which didn’t work, we think that this version maybe is not compatible with telefonica and we need help:

  1. Can you help us to know if any AT command which dettach relation between SIM and BC66 module?
  2. If any option to downgrade the firmware version to BC66NBR01A11 which works perfect?

Best regards.

Sergi

2

Can you provide relevant logs？