[Xperia Z General] ceLsiuZ:
Hi folks

To give something back to the community that always helps other users through countless useful roms, tipps and tweaks, I decided to make the ROM available that I just created to update my Xperia Z to the newest firmware version - Android 4.4.4 10.5.1.A.0.283. I was really annoyed from the bugs (laggy settings menu, battery drain, etc.) of the previous official 4.4.2 ROM, but this one - up to what I experienced until now - really runs like a charm again.

The creation of this firmware was no rocket science and probably most of you could have done it on your own. However, providing the ROM to you may save you some time and enables you a hussle-free update process since you don't have to combine all those tools like SuperSU and Dual Recovery on your own.

Here some facts:

Based on: Official 10.5.1.A.0.283_GenericDE for C6603 (obtained from here, thanks [MENTION=5210321]AlexX-DE[/MENTION])

Pre-rooted using latest SuperSU v2.02 (obtained from here, thanks [MENTION=631273]Chainfire[/MENTION])

Latest Dual Recovery 2.7.154 Beta included (obtained from here, thanks [MENTION=4904057][NUT][/MENTION])

Flashable firmware file created using PRFCreator v0.5 (obtained from here, thanks [MENTION=3975929]zxz0O0[/MENTION])

For your information: I came from this firmware from [MENTION=4904057][NUT][/MENTION] when installing this update.

To install this firmware:

Download this ZIP file

Extract it

Open the extracted folder Pre-Rooted_C6603_10.5.1.A.0.283_Generic_DE_DualRecovery

Connect your Xperia Z to your computer

Copy the flashable.zip onto your SD card

Disconnect your Xperia Z from your computer and turn it off (remember to have it charged to at least 50-70% battery power prior to flashing the firmware)

Boot into one of your existent recoveries - CWM or TWRP (I used TWRP)

Install the flashable.zip located on your SD card, wait for it to be successfully finished

(optional:) Clear cache/dalvik (I did it)

Reboot

IMPORTANT: Now

wait

! The reboot can take up to 10 minutes and eventually the screen might keep black showing nothing at the first startup.

When I flashed this firmware the first time and rebooted afterwards, it rebooted and vibrated, but the screen did not turn on for at least 5 minutes and I already thought I bricked it. But just when I started to panic and smash my head against the wall, the screen suddenly turned on and everything was perfectly fine again. It seemed that there was just a slight problem initializing the display for the first time after the flash while booting up and optimizing the apps (you know this process can take quite long, depending on how many apps are installed).

I tried to reproduce this error flashing the firmware again but I couldn't. After the next flash the screen worked fine even when starting the newly flashed firmware for the first time.

So remember, please don't panic when the first startup might take long and the display shows nothing as this is most likely only a temporary condition.

Nevertheless, I of course don't take responsibility for any potential damages or bricks that may be caused using this firmware, although I don't see major risks since it is the official release and I did not change anything at this firmware. Everything you do is on your own risk!

I know there is also a similar release by [MENTION=4694160]luala[/MENTION], but he based his firmware on the swedish SG firmware, mine is based on the german generic DE firmware, so probably of special interest for people from Germany.

In case of any problems or questions, please ask here. Even though I'm no professional developer I'm sure we will find a solution.

If this post was useful to you, please show it by clicking Thanks!

Wish you a lot of fun with your lag-free Xperia Z running on 4.4.4!

ceLsiuZ

@ Mods: Please move to the Development forum if more appropriate, I unfortunately couldn't post there.