topic Re: Z1 Downgrade 4.4.2 to 4.3? in Z Series

Z1 Downgrade 4.4.2 to 4.3?

PatrickB — Sun, 23 Mar 2014 20:18:14 GMT

Hello together,

Just updated today to Android Version 4.4.2.

Now many errors occur. Is it possible to downgrade to 4.3?

This new version ruines this phone...

Thanks in advance for your help!

Re: Z1 Downgrade 4.4.2 to 4.3?

Thommo — Sun, 23 Mar 2014 20:25:23 GMT

Yes you can downgrade but this has to be done manually - Please find a very detailed list of firmwares here - Instructions can be found here

or you can use this guide here - Ignore the title as it's the process you need to follow, simply download the .ftf file from the 1st link and substitute it as per point 5

Re: Z1 Downgrade 4.4.2 to 4.3?

PatrickB — Sun, 23 Mar 2014 20:29:30 GMT

Thank you for your help! Do i lose warranty if I flash it manually?

Re: Z1 Downgrade 4.4.2 to 4.3?

Thommo — Sun, 23 Mar 2014 20:34:07 GMT

I wouldn't like to say - Some say yes some say no - Now as you don't need to unlock your bootloader to flash and if you flash the firmware that is applicable to your phone ie: what it came with due to country etc then you should be fine - It's not like other phone manufactures which have a flash counter

Re: Z1 Downgrade 4.4.2 to 4.3?

gargamelo — Sun, 23 Mar 2014 21:09:01 GMT

How do i know which ftf i need if my country is not listed in the unbranded list?

Re: Z1 Downgrade 4.4.2 to 4.3?

Thommo — Sun, 23 Mar 2014 21:15:38 GMT

Do you know your customization number - Dial *#*#7378423#*#* then navigate to Service info then software info and half way down you'll see the number - Post back

Re: Z1 Downgrade 4.4.2 to 4.3?

waydhee — Mon, 24 Mar 2014 00:44:28 GMT

hello my z1 want to downgrade to 4.3 from 4.4.2

with customazion version

1276-7951_R3C

i already download FTF from ypur link before than i flash it with flashtool but still ini 4.4.2???

any link again???

Re: Z1 Downgrade 4.4.2 to 4.3?

Thommo — Mon, 24 Mar 2014 00:58:31 GMT

If you downloaded and flashed this C6903 14.3.A.0.681 Generic ID 1276-7951_R3C then you have flashed 4.4.2 - Anything that has .681 is KitKat so for the latest release of JB download a firmware with .136

Re: Z1 Downgrade 4.4.2 to 4.3?

yeochinh — Mon, 24 Mar 2014 01:47:04 GMT

Hi,

I was wondering about the same thing as I am extremely considering of downgrading my phone to 4.3

Which of the firmware should I download?

Thanks in advance!

Re: Z1 Downgrade 4.4.2 to 4.3?

gargamelo — Mon, 24 Mar 2014 10:59:17 GMT

customization version: 1280_2387_R3C

What .FTF file should I download for 4.3 ?

Re: Z1 Downgrade 4.4.2 to 4.3?

iamahmed — Mon, 24 Mar 2014 11:21:58 GMT

1277_2880_R1B <<which country is this from? Please help.

Re: Z1 Downgrade 4.4.2 to 4.3?

Thommo — Mon, 24 Mar 2014 15:48:11 GMT

That appears to be Global meaning it can be used in all countries and probably has no or very little bloatware

Re: Z1 Downgrade 4.4.2 to 4.3?

Aimiff — Tue, 01 Apr 2014 11:17:14 GMT

http://forum.xda-developers.com/showthread.php?t=2469191

Re: Z1 Downgrade 4.4.2 to 4.3?

Krisno — Sun, 06 Apr 2014 10:06:47 GMT

Hi, there

I just upgraded today.. Immediately my battery is draining faster and my phone is warm all the time (even on standby).. Also some video hardware acceleration is not available (I am using mx player to play .m2ts). So I want to downgrade back to 4.3. The thing is the customization version is 1276-7951_R3C and the FTF file is country specific for 4.4.2 Kitkat which is C6903 14.3.A.0.681 Generic ID 1276-7951_R3C... But I could not find the same country for Android 4.3 and I did not know what region my previous firmware was.. I mainly used my z1 for phone call, sms and video playback (super quality video playback) so 4.4.2 does not cut it for me. No errors or crashed encountered so far.Any suggestion or input ? Thank you

Re: Z1 Downgrade 4.4.2 to 4.3?

_alexdon_ — Sun, 06 Apr 2014 10:07:56 GMT

I think you should wait some more before downgrading.It will stabilise after some time,just let it understand your usage.

Re: Z1 Downgrade 4.4.2 to 4.3?

Krisno — Sun, 06 Apr 2014 16:16:38 GMT

Thank you for the quick reply..

I am going to try for a week or so to see how well this new OS performs. But I think I will still downgrade it after I confirmed with my local Sony Service Center that it will not void my warranty since I just bought this phone late January 2014. One of the major turn off with the new KitKat is it disabled some hardware acceleration for superb quality video playback, which is the only reason why I decided to upgraded to Xperia z1 with powerful snapdragon 800. I have played around with the new OS and so far I do not need or use any additional features in KitKat and I never had any problems with the previous 4.3.

Re: Z1 Downgrade 4.4.2 to 4.3?

_alexdon_ — Sun, 06 Apr 2014 22:17:19 GMT

Keep us updated.

Re: Z1 Downgrade 4.4.2 to 4.3?

Krisno — Mon, 07 Apr 2014 09:37:23 GMT

I went to the local Service Center today and at first they denied that such bugs exist, must be something wrong with the device. Then they said that downgrading the os will void the warranty and if i want to they can re flash the current Kitkat, or everytime my device overheated they can re-flash it.Which means i have to go there EVERYDAY :D. Then they said (just saying...) they can fix it when the device broke down and the warranty will cover the battery as well (I highly doubt this). In short, garbage OS and crap Xperia Care.

To be honest I was a huge fan of Sony Ericsson W series, then the same crap happened before, I moved to Samsung from Galaxy Tab 1 till now. I decided to give Sony another go since the Customer Service and all seems to be modernised and the product seems a lot better. Apparently I am wrong, dead wrong...They are still the same crap and garbage as before (well at least in Indonesia they are)... So disappointed, now my expensively bought 3 month old Z1 will be a standby phone running power safe mode from 80 percent battery... Crap... total crap...

Re: Z1 Downgrade 4.4.2 to 4.3?

juniorlpa — Mon, 07 Apr 2014 12:47:49 GMT

Hi could you give me some help here, I'm experience the same problem.

My z1 that I want to downgrade from 4.4.2 to 4.3 with customazion version

1276-7948_R6C

Thank you!

Re: Z1 Downgrade 4.4.2 to 4.3?

juniorlpa — Tue, 08 Apr 2014 14:43:04 GMT

Hello Guys,

I did the downgrade from the 4.4.2 to 4.3 and now my Z1 is working fine again.

Anyway, thanks for the post, that really helps me a lot.

Here is the link that I use to download the right version for my phone

C6903_14.2.A.1.136_Generic 20HK_1276-7948_R4B.ftf

http://pan.baidu.com/s/1c0zirDY

Thanks.