Samsung SIII i9300 Dead boot repair solution & imei null solution only for i9300
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If you're sure you've noticed the boot, then skip this step.
After done this your mobile must be in download mode or white screen if white screen manually put into download mode.
Now update your mobile with factory firmware with PIT file lik below given n the picr.Factory firmware
AndroidFirmwares.net - Download Firmware
After update complete your mobile may not have imei .imei null or your mobile will not boot bcoz of dead boot repair. your efs must be corrupted
* To Fix this prob first root your mobile Download from here (flash it through odin select as odin)
CF-Root Download
* Now Download this EfS repair file and flash it through odin select as odin your mobile must boot
but the imei become lik this 004999010640000
I9300_Repair_efs.tar.rar
i9300_repair_efs.tar - Download - 4shared - Sanjeev Chauhan
If your imei is null you cant repair using this box so 1st you have to repair the efs using above given file. if your imei become like this only (004999010640000) you can repair using z3x or other samsung tool