ACTIVATION
After a software update an activation code must be provided.
This code is released by the manufacturer upon customer request.
The code must be provided within the upgrading tool or by means of command
AT#CODE=<zzzz>
<zzzz> is the activation code
Until the code is provided, upgraded device is blocked at the initialization phase.
WARNING
After 10 failure insertion, device is stuck definitely and must be returned to factory.