I doubt how to downgrade the FW

Technical Subjects
1

how to downgrade the FW EG06ELAR04A20M4G to EG06ELAR04A08M4G

2

Sorry about that.
The new firmware version cannot be downgraded to previous versions, otherwise the module will not be able to work normally.
Relevant technical controls have been carried out to restrict normal network registration in regions such as RUS and IRN, thus ensuring that the module can be used only for civilian applications.

3

Thank you for the clarification. However, the device will not be used in both countries. I am considering this solution because the previous version worked fine and provided a stronger signal.

4

There is much newer version than EG06ELAR04A20M4G.
Maybe you can try.