i9305 imei null /null after write code
 

1 Go to dial window.
2. Enter "*#7284#" number.
3. Set "USB" radio button to "MODEM" value.
4. Go to "Qualcomm USB Settings".
5. Select "RNDIS+DM+MODEM".
6 Enter "*#9090#" number.
7. Select DM/DUM over HS-USB

Then appear warning i didnt read it << radio word was mentioned >>
After that the phone reboot then i have imei null and unknown baseband
i flashed it with its orginal firmware and tried 4.1.2 and flash it with Param_Bin_I9305.tar.md5 using odin
but still the same

Flash with Different Firmware...or reset Default EFS.