[Xperia Z Q&A, Help & Troubleshooting] keringkien:
C6603 Stuck in bootloop! [Last update: 24/1/14]​

UPDATE 24/01/14

This issue has been SOLVED.

I replaced the battery with one from eBay and the phone is working flawlessly, all the ROM flashing I went through was not the problem at all. Remember that if you are going to try to replace the battery you may as well buy a new rear glass piece as it is almost guaranteed that the glass will break in the removal process. You will also require new a adhesive piece. The entire procedure cost me $51AUD (battery, glass, adhesive).

All the content below is irrelevant, if your phone randomly shuts off (instantaneously) on boot or soon after, try to replace your battery!

Thanks for your help.

I've got quite a story to tell and if you have the patience to read it, I will greatly appreciate your assistance. TL;DR BELOW

In the beginning I was running 4.2.2, on a stock Australian 10.3.A.0.423 Unbranded ftf. It had been working flawlessly for a month or so until quite recently. It had developed a problem where it would only remain switched on whilst being plugged into the wall socket. As soon as (or thereafter) I removed the plug out of the phone, with one touch, one action, BAM! The display was off and I had to restart the phone again. I spent a few hours browsing for solutions to this problem, most of them said to hold the power and vol+ buttons until the handset vibrated 3 times. That turned it off alright, but I'm looking to go in the other direction.

After a stressful while scrounging old forum posts, I came to the conclusion that the fault is in my ROM, after all, I had flashed from 4.1.2 (I think) to 4.2.2 just a month prior (I flashed a ROM instead of waiting until the snail-like carriers here in Australia decided to dribble out the release). So now being convinced that I ROM is at fault I browse XDA for a newer stock one. Hey! Look! 4.3 it being rolled out in Aust, I check whether it's available to me yet, and obviously, no, it is not. I stumble upon this thread in my travels. I spend a while working to meet it's requirements. Get flashtool, get unlocked bootloader, get root, install cwm, and attempt to install XzDualRecovery 2.6. I've placed the XDR.zip on the sdcard in the XZ, I run the zip using CWM, it seems successful, I then go to reboot and check whether my 4.3 works, after I select reboot I'm asked whether I wish to root the phone. Why yes! that seems easy enough, and just as I select 'ok' the screen goes blank. The bloody phone has switched off in the middle of my work! I try to boot and it hangs on the Sony logo then reboots, creating a cycle. I decide to plug it back in to the wall socket (as this is the only way to get it to boot and remain on), huzzah, it runs. But the root had failed. The rest of my rant is insignificant until now (around 7 hours of failed attempts later)

So in an attempt to keep this wall of text down, I try my best to summarize, If I am not clear enough, just say.

I tried reflashing my old 4.2.2 ROM back, this makes the whole thing worse, now the phone won't even get past the Sony logo (even when plugged to a socket), I flash a different 4.3 ftf, nothing, I restore with PCC, I restore with SUS, I create a ftf from the SUS files and attempt to flash that. Nothing, nothing works. So where am I at now?

The phone still has battery, although, I'm not sure how much, I can no longer get it to charge as it hangs on the Sony logo. The phone should be flashed with 10.3.A.0.423, but when I check the baseband version in Fastboot cmd prompt, it still says 10.4.B.0.569, I feel as though flashtool isn't flashing properly, but I've read that this is usually a non-issue. I can boot into flashmode and fastboot mode. I can unlock and lock the bootloader. I can use ADB and Fastboot CMD (Minimal version) to read values and run commands. Actually, I managed to use the phone in fastboot mode, in conjunction with ADB and Fastboot CMD, I ran the command "fastboot continue" and the phone went on to charge off the usb power, It didn't seem to charge very fast, or at all, and I haven't been able to get it to do it again. So a TL;DR:

-C6603 stuck in bootloop.

-Possibly has a 4.2.2 ROM installed (10.3.A.0.423 Unbranded AU)

-Cannot Charge

-Can run flashmode and fastboot mode

-Can use ADB and Fastboot

-Can use SUS, PCC, and Flashtool to flash stock roms

-Can't figure this out for the life of me!

UPDATE 01/01/14

Currently I have a kernel installed that allows me to use cwm twrp (doomkernel v19, maybe), I have flashed a 'flashable' stock 4.3 rom using cwm and the phone didn't manage to get past the kernel logo. HOWEVER, using fastboot mode, I run the command "fastboot continue", and if I allow the phone to go past the kernel logo it vibrates, the LED turns green as opposed to showing a purple one, and it will begin charging (The LED isn't green as a result of the battery level). EDIT [1/1/14 3:01AM]: I tried to launch the phone whilst it was charging, the charging symbol went away and the phone remained on a black screen (lcd is on, but nothing is displayed) for a few seconds before shutting off automatically.

I must mention, I cannot get into recovery unless I boot the phone into fastboot mode, run the command in fastboot: "fastboot continue". If I don't do this, it simply crashes (shuts off) when showing the kernel logo.

If you need to know more I will provide as much information as I can, as succinct as I can, as fast as I can. I am in this for the long run.

Thank you for your time

,

UPDATE 08/01/14

I've come to the conclusion that my issue is battery related. After repeated from flashes and fastboot attempts, I managed to get the phone charging a few times, I witnessed the level was sporadic upon infrequent viewings. I have come across a few other very similar threads and feel that it is necessary to try replacing the battery, I try and post a youtube clip that details what happens currently.

Keringkien