My phone broke about a year ago (IMEI null, not generic; Serial Number modificated; unknown baseband). This happended when I tried to flash the thirth time the ENOX ROM, and a couple of days after the phone begun to run slower, and 4 hours after (during the same day) the phone have frozen and didn't boot anymore.
Then I tried to flash (stocks ROM, stocks ROM with root, CM, Carbon ROM, etc...) and I cannot regenerate or recover the IMEI/SN/Baseband.
I have not any box to try to fix my phone, and I cannot buy one (a lot of money for me just now).
I thought that if it possible a thing, I would like to test but I don't know if it's possible.
I was thinking in take a entire EFS folder from other device SGS3 mini (same model, no L/N) and try to edit the files that contains the IMEI information and this thinks with hexadecimal editor. It would be possible? Or it's stupid try to do this? I don't know... **** (sorry).