Users of this phone, sometimes, lose IMEI when flash ROMs 😦
The reason is we have more then one radio/GSM firmware.
There is no need to flash a nb0 file format every time you flash a new ROM (zip format), it’s stupid, right?
For example, I’m using Fromanya as base (always do) and I test or make ROMs based on CM7 without problem, so:
-never flash nb0 file before
-have a CWM backup with my stuff
-don’t like ROM, it’s too bugy and want to restore? Just restart in recovery and restore, without PC 🙂
If you start your phone in download mode and appears:
Flash Mem: SAMSUNG_XXXXXXXXXX(4G/2G)
Modem REV: FXX-3-230-00
flash this file, after ROM 🙂
2) there is more than one version like I sad
Thanks to @Fagulhas for radio fix 🙂