FORUMS

Voices Of XDA: Orbiting The Earth With Android

Editor’s note: This week’s feature has been written by forum … more

CloudPlayer: DIY HiFi Music Streaming Solution

In our Helpful Guide to Music Streaming Services, we mentioned several different services … more

Optimize Battery Life with This Useful App

Battery life is an important aspect of your smartphone, especially if you use it for more … more

The OnePlus 2 & The Year of Smartphone Compromises

We are very close to entering the last third of 2015, and we have now seen many of … more

Going back to stock, no backup

191 posts
Thanks Meter: 90
 
By ToastnButter, Senior Member on 5th February 2014, 10:07 PM
Post Reply Subscribe to Thread Email Thread
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  
mbc07's Avatar
Senior Member
Thanks Meter: 593
 
Donate to Me
More
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  
Senior Member
Flag Mumbai
Thanks Meter: 13
 
More
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  
ToastnButter's Avatar
OP Senior Member
Flag Rybnik/Kraków
Thanks Meter: 90
 
More
Sh!t. That's not good.
Thank you guys for answers!
6th February 2014, 05:29 PM |#5  
ToastnButter's Avatar
OP Senior Member
Flag Rybnik/Kraków
Thanks Meter: 90
 
More
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  
dunc4n88's Avatar
Senior Member
Thanks Meter: 221
 
More
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  
ToastnButter's Avatar
OP Senior Member
Flag Rybnik/Kraków
Thanks Meter: 90
 
More
Sh!tness. So I guess I'm stuck with the phone forever.
Thanks!
7th February 2014, 05:41 AM |#8  
mbc07's Avatar
Senior Member
Thanks Meter: 593
 
Donate to Me
More
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...
The Following User Says Thank You to mbc07 For This Useful Post: [ View ]
7th February 2014, 07:48 PM |#9  
ToastnButter's Avatar
OP Senior Member
Flag Rybnik/Kraków
Thanks Meter: 90
 
More
Well that's a very comprehensive answer! Thanks!
Post Reply Subscribe to Thread
Previous Thread Next Thread
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes