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Going back to stock, no backup

OP ToastnButter

5th February 2014, 10:07 PM   |  #1  
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Hey, I'm about to sell my phone, so I need to get it to its factory state. Prefably so that the guy that buys it could send it over for repairs if needed.
And so I did not backup the TA partition. From what I've read that means no relocking the bootloader. Fine.
But how do I go back to the original 4.1.2 sony-branded system?
I'm currently on CM11. Can I just use Sony Companion to perform the update, is it safe? What steps should I undertake?
6th February 2014, 02:51 AM   |  #2  
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As far as I know, Sony Update Service won't work with unlocked bootloader (I may be wrong), however, you just need Flashtool and a FTF from the latest stock firmware for Xperia M single SIM (currently at 15.1.C.2.8)
6th February 2014, 10:08 AM   |  #3  
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Sorry mate but you can't lock your bootloader without DRM keys(TA PARTITION BACKUP).
You can flash stock ROM using FTF flashtool and but i cant relock your bootloader but you will get stock rom back.
Warranty is void now!!
6th February 2014, 05:28 PM   |  #4  
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Sh!t. That's not good.
Thank you guys for answers!
6th February 2014, 05:29 PM   |  #5  
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One more thing.
Is it possible to receive OTA updates after I unlocked bootloader and flashed the stock firmware with flashtool?
6th February 2014, 06:53 PM   |  #6  
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No once bootloader is unlocked it bricks the device doing ota updates

Sent from my C1905 using xda premium
6th February 2014, 07:07 PM   |  #7  
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Sh!tness. So I guess I'm stuck with the phone forever.
Thanks!
7th February 2014, 05:41 AM   |  #8  
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Further info for future Xperia phones you may buy: when you unlock your bootloader your DRM keys get wiped, without them, OTA updates, Mobile Bravia Engine (in models that have them -- not the case for Xperia M), Track ID, Download Music Info and SensME (alongside some other proprietary apps/features) will not work, even if you flash stock firmware again.

Before unlocking your bootloader it's always recommended to do a TA backup first, so, if you need, you can relock your bootloader to get your DRM keys back and make proprietary Sony apps/features working again. Since you didn't backup your TA partition before unlocking, you are out of luck now and there is no way of relocking your bootloader.

Also, DO NOT EVER TRY restoring a TA backup from another device (even if it's exactly the same model), TA partition contain some unique info and flashing a TA backup from another device will permanently hard brick your phone...
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7th February 2014, 07:48 PM   |  #9  
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Well that's a very comprehensive answer! Thanks!

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