[Q] Downgrade from 4.3 (C6903) Xperia Z1 14.2.A.0.290 Generic NCB (Unbranded/Nordic)

Search This thread

johnnydrift

Member
Jan 19, 2014
6
0
Hi everybody!
This is my first post as I usual solve my problems just by reading others people posts.
I recently flashed my z1 (C6903) to 14.2.A.0.290 Generic NCB (Unbranded/Nordic) (4.3 android) as I didn 't like the DE(german version) with the bloatware. I rooted it before with kingo but lost my root after flashing the NCB version I'm now looking for a way to downgrade to a older ncb version root it with kingo and then do a ota upgrade to keep the root. Does anybody have the FTF therfore and what boxes should I pick I want to keep my data or should I let it do a full wipe do a backup with sony companion or the sony app on the phone and than play it in after finishing the downgrade root and OTA? Pls help me I' m completly lost and I'm really missing the root.

Thanks in advance to everyone!!!!!

john
 

xasbo

Senior Member
Feb 10, 2012
447
115
Does anybody have the FTF therfore and what boxes should I pick I want to keep my data or should I let it do a full wipe do a backup with sony companion or the sony app on the phone and than play it in after finishing the downgrade root and OTA?

My experience is that if older FTFs aren't in the mega thead (http://xdaforums.com/showthread.php?t=2469191), then you won't find them anywhere. Mega thread only has a 290 FTF for NCB, so you may be SOL if you want to strictly downgrade to 534 NCB and then OTA to 290. However, as long as you flash a generic FTF, you won't get carrier bloatware.

If root is what you'd want, I'd go with [NUT]'s pre-rooted 290: http://xdaforums.com/showthread.php?t=2572988. It's the easiest way to get full root.
 

Rekoil

Senior Member
May 17, 2008
1,143
497
Göteborg
www.idroidproject.org
Hi everybody!
This is my first post as I usual solve my problems just by reading others people posts.
I recently flashed my z1 (C6903) to 14.2.A.0.290 Generic NCB (Unbranded/Nordic) (4.3 android) as I didn 't like the DE(german version) with the bloatware. I rooted it before with kingo but lost my root after flashing the NCB version I'm now looking for a way to downgrade to a older ncb version root it with kingo and then do a ota upgrade to keep the root. Does anybody have the FTF therfore and what boxes should I pick I want to keep my data or should I let it do a full wipe do a backup with sony companion or the sony app on the phone and than play it in after finishing the downgrade root and OTA? Pls help me I' m completly lost and I'm really missing the root.

Thanks in advance to everyone!!!!!

john

Here's a link to the correct FTF (note that it is .257, so follow the guides regarding rooting .257, or if you're savvy, install a .534 kernel, root with Kingo, install a .257 kernel again, then OTA)

https://mega.co.nz/#!WkolCYjB!IIXR5SgAn-J05MXmG26GYyi2P2sYcF34Avn73z5Y9n0

It is incorrectly named Generic SE, but it is the right customisation ID for Generic NCB (1276-9897).
 

johnnydrift

Member
Jan 19, 2014
6
0
Code:
Here's a link to the correct FTF (note that it is .257, so follow the guides regarding rooting .257, or if you're savvy, install a .534 kernel, root with Kingo, install a .257 kernel again, then OTA)



It is incorrectly named Generic SE, but it is the right customisation ID for Generic NCB (1276-9897).


Hi guys!
Thanks for ur fast answer two last questions if I want to keep all my data and apps whats the ebst way to keep them or transfer a backup? And what is the right rooting methode for the 257. I can flash it without any kernel problems?I wanted to do the one click root methode with kingo I thought it s just plug and root( doens it root allkernels?) did tht last time....

Thanks again!!!
 

Rekoil

Senior Member
May 17, 2008
1,143
497
Göteborg
www.idroidproject.org
Code:


Hi guys!
Thanks for ur fast answer two last questions if I want to keep all my data and apps whats the ebst way to keep them or transfer a backup? And what is the right rooting methode for the 257. I can flash it without any kernel problems?I wanted to do the one click root methode with kingo I thought it s just plug and root( doens it root allkernels?) did tht last time....

Thanks again!!!

Sony PC Companion can make a backup for you, I don't know how much will be saved as in order to flash a 4.2.2 ROM you'll need to wipe your data partition.
 

xasbo

Senior Member
Feb 10, 2012
447
115
Thanks for ur fast answer two last questions if I want to keep all my data and apps whats the ebst way to keep them or transfer a backup? And what is the right rooting methode for the 257. I can flash it without any kernel problems?I wanted to do the one click root methode with kingo I thought it s just plug and root( doens it root allkernels?) did tht last time....

257 can't be rooted manually, only 534 can be rooted by vRoot/Kingo/etc.

Since you are downgrading, you must wipe data and will lose everything you don't copy off the phone.
 

johnnydrift

Member
Jan 19, 2014
6
0
257 can't be rooted manually, only 534 can be rooted by vRoot/Kingo/etc.

Since you are downgrading, you must wipe data and will lose everything you don't copy off the phone.
So I have to get the 534 ftf generic or nordic do a backup with Sony companion before.flash the 534 root it and let it do ota twice to 257 and then to 290 again ota and I ll keep the root.
 

xasbo

Senior Member
Feb 10, 2012
447
115
So I have to get the 534 ftf generic or nordic do a backup with Sony companion before.flash the 534 root it and let it do ota twice to 257 and then to 290 again ota and I ll keep the root.

No, it's not possible to upgrade 257/290 and keep root. You asked about downgrading, not rooting 290. If you have an unlocked BL, go read the dev thread on how to root 290. With a locked BL, you'll need to get rooted 534/257 and then flash a custom pre-rooted ROM from the dev forum.

General: http://xdaforums.com/showthread.php?t=2440565
290 pre-root options: http://xdaforums.com/xperia-z1/development
unlock BL 290 root: http://xdaforums.com/showthread.php?t=2573921
 
Last edited:

Rekoil

Senior Member
May 17, 2008
1,143
497
Göteborg
www.idroidproject.org
No, it's not possible to upgrade 257/290 and keep root. You asked about downgrading, not rooting 290. If you have an unlocked BL, go read the dev thread on how to root 290. With a locked BL, you'll need to get rooted 534/257 and then flash a custom pre-rooted ROM from the dev forum.

General: http://xdaforums.com/showthread.php?t=2440565
290 pre-root options: http://xdaforums.com/xperia-z1/development
unlock BL 290 root: http://xdaforums.com/showthread.php?t=2573921

Actually with OTA you keep semi-root, but in essence you're right. Actually I think the easiest solution is to flash a stock .534 ROM, root it with Kingo, grab TA partition backup, flash .290, unlock bootloader, flash a recovery, do a proper root, reflash stock boot partition, flash TA backup.
 

xasbo

Senior Member
Feb 10, 2012
447
115
Actually with OTA you keep semi-root, but in essence you're right. Actually I think the easiest solution is to flash a stock .534 ROM, root it with Kingo, grab TA partition backup, flash .290, unlock bootloader, flash a recovery, do a proper root, reflash stock boot partition, flash TA backup.

Yeah, true, I've just stopped telling people about partial root since full root is possible. Those who don't know to ask don't know what it means anyway, and it's just simpler for everyone involved to leave it out.
 

johnnydrift

Member
Jan 19, 2014
6
0
how to guide

Hey guys thanks for the answers.I really don't want to unlock the bootloader is there any other way to get root on 4.3 and what would be the steps thank you!!!
 

eclyptos

Senior Member
Jun 14, 2008
3,040
640
Planet Earth
Hey guys thanks for the answers.I really don't want to unlock the bootloader is there any other way to get root on 4.3 and what would be the steps thank you!!!

Are you joking? We already told you what you have to do but I think you didn't read a word from all the post because you will know something now.

I posted this already here and this is Root and Custom Rom for Locked Bootlader Step by Step Guide, Page 2, Post #16, Here

Android 4.3 FTF .290 Root only for Locked Bootlader, Here