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Galaxy n7000 efs error, no imei, no lock screen, can not upgrade os

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By XsoodX, Junior Member on 13th February 2014, 07:31 AM
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Hello everyone.

I just got my dad's old Galaxy not n7000. It had android ICS 4.0.3 on it.
I wanted to install a custom rom, so i rooted and installed one, but it got stuck on boot loop, though i followed all steps properly.
I restored back to the stock 4.0.3 using odin. After restoring, the lock screen would not show, nor would it detect my sim card. i couldn't fix it in the phone options. I googled the problem and it told me to check my imei. My phone didn't have one. I decided to try and install another custom rom, but it didn't work, went into bootloop again. I tried another, same thing. So i decided i would just update my phone to the official 4.1.2 update released in UK using odin.
but again went into bootloop. i restored it to 4.0.3 and it worked. However, when i went into recovery while in 4.1.2, a red error showed saying :failed to mount /efs.

Something is seriously wrong and i need help.

Thanks in advance.

Also I should note that, couple of years ago, there was an official update released by samsung, but that too made the phone go into a boot loop. we had to recover it using odin.
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