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How to unlock bootloader 4.1.2 firmware?

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edj809
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(Last edited by edj809; 11th February 2014 at 01:52 AM.)
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Default How to unlock bootloader 4.1.2 firmware?

My s3 i747 come with 4.1.2 and the bootloader is locked, how unlock the bootloader?

i want downgrade to 4.1.1 but i can't, any idea how to make the downgrade?
 
audit13
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Which phone? Carrier? You may be able to use Odin and firmware from samfirmware.com.
 
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Originally Posted by audit13 View Post
Which phone? Carrier? You may be able to use Odin and firmware from samfirmware.com.
S3 I747 at&t, i can flash the firmware 4.1.1 although this blocked the bootloader?
 
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From what I have done with my Canadian s3, which is an i747m, I can downgrade from 4.1.2 to 4.1.1 with no problem via Odin. The bootloader is not locked. As far as I know, the only bootloader the could be considered "locked" would be in the stock 4.3 ROM. Once your phone is on 4.3, you cannot downgrade the bootloader.
 
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Originally Posted by audit13 View Post
From what I have done with my Canadian s3, which is an i747m, I can downgrade from 4.1.2 to 4.1.1 with no problem via Odin. The bootloader is not locked. As far as I know, the only bootloader the could be considered "locked" would be in the stock 4.3 ROM. Once your phone is on 4.3, you cannot downgrade the bootloader.
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Did you try to downgrade with Odin?
 
edj809
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Did you try to downgrade with Odin?
maybe brick or not?
 
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You won't brick. I've downgraded several times. You're most likely to brick with 4.3, and not 4.1.2, 4.1.1, or 4.0.4.

Sent from my SAMSUNG-SGH-I747 using XDA Premium 4 mobile app
 
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look the pics
My download screen says the same thing and I'm on stock 4.1.2.
 
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You won't brick. I've downgraded several times. You're most likely to brick with 4.3, and not 4.1.2, 4.1.1, or 4.0.4.

Sent from my SAMSUNG-SGH-I747 using XDA Premium 4 mobile app
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My download screen says the same thing and I'm on stock 4.1.2.
Thanks, I did the downgrade without any problems and now I'll try to flash a custom rom, even though I still see that the bootloader is still enabled using the 4.1.1

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