[Android] Backup / restore nv item:

Backup nv item:

Adb root

Adb remount

Adb shell dd if=/dev/block/bootdevice/by-name/modemst1 of=/data/modemst1.bak

adb pull /data/modemst1.bak .

adb shell dd if=/dev/block/bootdevice/by-name/modemst2 of=/data/modemst2.bak

adb pull /data/modemst2.bak .

erase nv item:

fastboot erase modemst1

fastboot erase modemst2

fastboot erase fsg

restore nv item:

fastboot flash modemst1 modemst1.bak

fastboot flash modemst2 modemst2.bak