disable/revive flashdrive
The integrated flashdrive can be disabled by executing the following AT-command:
at^u2diag=256
If your modem answers ERROR, instead you can use command:
at^u2diag=0
Unfortunately this command will also disable the microSD-drive.
To revive the flashdrive and the microSD-drive execute:
at^u2diag=255
Tested to work on: E160, E1552