Develop Bugs

[Q] Reporting Issues with installation of Jelly Sandwich ROM 6.0 / 6.1

Hi
I am really thankful for the all the developers involved in the development of Jelly sandwich ROM (latest release), which is one of the most awesome custom ROM (I believe).
However, I've personally tried to install the ROM but failed several times, as my arc just gets stuck at SONY LOGO
I have also tried browsing different threads on this forum to locate a similar issue however could not find one stating the above issues with ROM installation. I am very sure there is something that I missing or failing to do right, therefore seek some help from the right team,
Unfortunately there is no list / screenshot made available by the developers to help understand the best option to select in the AROMA installer.
I am creating this thread here assuming some helping hand would be provided with the above issue.
Thank you.
Sony Ericsson Xperia Arc - Stock kernel (.587) .. Stock ICS 4.0.4 rom

I wanted to install the new 6.1 jelly sandwich. Followed instructions for people coming from older JB - just update via CWM but after doomkernel logo screen goes, and remains black.
Then i wiped everything and tried to install as I would be coming from other rom - the same result.
Then i went for the "if something goes wrong" option, again with the same result.
Now im restoring my previous 5.0 JS hoping it will work normally
Anyone else having similar issues?
Im running Lt15i on doomkernel, jelly sandwich 5.0 from maxio1998
thread: http://forum.xda-developers.com/showthread.php?t=1836993

Same problem here with JS, Remix and Pureness. Tried each one several time.
Every time get stuck on Sony logo and then I have to restart the long process for restoring 587 with root.
I carefully followed procedure for each ROM.
--------What I did before---------------------------
Rooted with this method : http://forum.xda-developers.com/showthread.php?t=1683957
Bootloader unlocked with s1tool and testpoint: http://forum.xda-developers.com/showthread.php?t=1551494&highlight=bootloader
... SimUnlocked with purchase code from cellunlocker (Rogers phone).
Was never able to boot in fastboot (tried a lot!!! no blue light except when cwm is installed with flashtool), so no custom kernel
And in Service info it says Bootloader unlock allowed : no (flashtool says its already unlock when I try to do it)
I'm discouraged

Jelly Sandwich
I had exactly the same issue as well. I was on locked bootloader. Tried several times. Got fed up trying because everytime i would flash the rom, CWM would get wiped off. So i decided to unlock the bootloader, root and flash kernel and rom. And VOILA! Success! But......The only issue im facing is that the Data network doesn't seem to be working. But i think its a kernel issue, not rom related. If anyone can help with my issue there then that would be great. Other than that the rom works Great!
RedWolff said:
Same problem here with JS, Remix and Pureness. Tried each one several time.
Every time get stuck on Sony logo and then I have to restart the long process for restoring 587 with root.
I carefully followed procedure for each ROM.
--------What I did before---------------------------
Rooted with this method : http://forum.xda-developers.com/showthread.php?t=1683957
Bootloader unlocked with s1tool and testpoint: http://forum.xda-developers.com/showthread.php?t=1551494&highlight=bootloader
... SimUnlocked with purchase code from cellunlocker (Rogers phone).
Was never able to boot in fastboot (tried a lot!!! no blue light except when cwm is installed with flashtool), so no custom kernel
And in Service info it says Bootloader unlock allowed : no (flashtool says its already unlock when I try to do it)
I'm discouraged
Click to expand...
Click to collapse

mastermjr2004 said:
I had exactly the same issue as well. I was on locked bootloader. Tried several times. Got fed up trying because everytime i would flash the rom, CWM would get wiped off. So i decided to unlock the bootloader, root and flash kernel and rom. And VOILA! Success! But......The only issue im facing is that the Data network doesn't seem to be working. But i think its a kernel issue, not rom related. If anyone can help with my issue there then that would be great. Other than that the rom works Great!
Click to expand...
Click to collapse
Looks like I will have to unlock my bootloader after hearing your story

I think mount system and even format system solved the exact same issue you are having thou I'm now back to GB because of the extra ram it can offer and more games support without fc.

[Q] Problem after trying to root Arc S

Hello,
First of all, I did try to look for other topics about this issue. However, working through sometimes a couple of hundred pages in a thread and to sift through all the topics here could mean I missed something. If so, I'm sorry, feel free to point me to a fix, and then I'll try that.
So here's my problem,. While trying to root my SE Arc S I seem to have put it in some kind of situation I can't fix: I'm now stuck at running stock ICS 4.04 (4.1.B.0.431), lost my root (and looks like i also lost CWM recovery), can't flash anything and can't root the phone again.
So, would anoyone know how to fix this? Please, keep any instructions as easy and clear as possible. As you'll probably see in the rest of my post i'm pretty new/noob at this stuf.
Here are the things I did to get to this point (before all this I started out with ICS 4.04 build 4.1.B.0.587)
- First I unlocked my bootloader, that seemed to work. I followed the steps on the sony instruction page
- Second, I rooted the phone, by following a combination of the steps in this thread: http://forum.xda-developers.com/showthread.php?t=1683957 and on another non xda page (the steps seemed similar, but the non xda page was a little clearer/easier/more noob friendly for me.) That also worked, since I could use Titanium Backup (can't now)
- Third, I installed CWM with RecoverX. That worked, since I could enter CWM.
- Fourth, I tried installing different ROM's (cyanogenmod) by storing it on my sd card and installing it via CWM. That's where the problems started.
First of all I couldn't install any of the ROM's i tried. CWM would start installing it and then gave a status 7 error and aborted the installation. After trying the same process a couple of times my phone got stuck on the Sony screen after rebooting.
To fix this i flashed a stock android thingy (not sure if it's a rom, kernel, or whatever, anyway it's the version i'm running now) That worked and my phone at least functioned again.
However, since I don't wanna run this version I looked for ways to flash/install a different one. That's when I noticed I lost my root (an app i dl'ed that needs superuser privilleges didn't work) I tried rooting the phone again, but found I couldn't even flash anything. If i tried that, flashtool would give an error about not recognising the phone and stopped the flashing process. Then i tried to unlock the bootloader again, to see if that might work. But that didn't work either cause again my pc didn't seem to recognise the phone. I also tried using the doomlord root app. That seemed to work, but somehow after finishing it i didn't end up with root priviliges (again, I checked this by trying to use a root required app)
So, now I can't unlock the bootloader, I can't flash anything and I can't root my phone. All I can do is use it. And thought that's obviously the most important thing, I would like to be able to do more with it.
So, does anyone know how to fix this? It all seems to boil down to my phone not getting recognised while in fastboot/flash mode. But I wouldn't know how to fix that...
A lot of thanks in advance for any help!

ilporro said:
Hello,
First of all, I did try to look for other topics about this issue. However, working through sometimes a couple of hundred pages in a thread and to sift through all the topics here could mean I missed something. If so, I'm sorry, feel free to point me to a fix, and then I'll try that.
So here's my problem,. While trying to root my SE Arc S I seem to have put it in some kind of situation I can't fix: I'm now stuck at running stock ICS 4.04 (4.1.B.0.431), lost my root (and looks like i also lost CWM recovery), can't flash anything and can't root the phone again.
So, would anoyone know how to fix this? Please, keep any instructions as easy and clear as possible. As you'll probably see in the rest of my post i'm pretty new/noob at this stuf.
Here are the things I did to get to this point (before all this I started out with ICS 4.04 build 4.1.B.0.587)
- First I unlocked my bootloader, that seemed to work. I followed the steps on the sony instruction page
- Second, I rooted the phone, by following a combination of the steps in this thread: http://forum.xda-developers.com/showthread.php?t=1683957 and on another non xda page (the steps seemed similar, but the non xda page was a little clearer/easier/more noob friendly for me.) That also worked, since I could use Titanium Backup (can't now)
- Third, I installed CWM with RecoverX. That worked, since I could enter CWM.
- Fourth, I tried installing different ROM's (cyanogenmod) by storing it on my sd card and installing it via CWM. That's where the problems started.
First of all I couldn't install any of the ROM's i tried. CWM would start installing it and then gave a status 7 error and aborted the installation. After trying the same process a couple of times my phone got stuck on the Sony screen after rebooting.
To fix this i flashed a stock android thingy (not sure if it's a rom, kernel, or whatever, anyway it's the version i'm running now) That worked and my phone at least functioned again.
However, since I don't wanna run this version I looked for ways to flash/install a different one. That's when I noticed I lost my root (an app i dl'ed that needs superuser privilleges didn't work) I tried rooting the phone again, but found I couldn't even flash anything. If i tried that, flashtool would give an error about not recognising the phone and stopped the flashing process. Then i tried to unlock the bootloader again, to see if that might work. But that didn't work either cause again my pc didn't seem to recognise the phone. I also tried using the doomlord root app. That seemed to work, but somehow after finishing it i didn't end up with root priviliges (again, I checked this by trying to use a root required app)
So, now I can't unlock the bootloader, I can't flash anything and I can't root my phone. All I can do is use it. And thought that's obviously the most important thing, I would like to be able to do more with it.
So, does anyone know how to fix this? It all seems to boil down to my phone not getting recognised while in fastboot/flash mode. But I wouldn't know how to fix that...
A lot of thanks in advance for any help!
Click to expand...
Click to collapse
I had the same problem. First of all if you have bootloader unlocked it is still unlocked even if you had flashed another rom.
What rom did you exactly flashed? What OS do you use on your computer? When I started to flash different stock roms and then to root them then I unlocked my bootloader then the same problem appeared on Windows 8 (I could find no way to make my phone recognisable - don't know why). I tried to flash rom again on another one running on Winows 7 and after instaling drivers from flashtools and instaling sony companion phone started to be recognized.
So try to connect your phone to another Pc (if possible) and then flash any stock rom (for example ICS 4.04 build 4.1.B.0.587) and then (if you have unlocked you bootloader) flash any pre-rooted kernel (http://forum.xda-developers.com/showthread.php?t=2159411).

ilporro said:
Hello,
First of all, I did try to look for other topics about this issue. However, working through sometimes a couple of hundred pages in a thread and to sift through all the topics here could mean I missed something. If so, I'm sorry, feel free to point me to a fix, and then I'll try that.
So here's my problem,. While trying to root my SE Arc S I seem to have put it in some kind of situation I can't fix: I'm now stuck at running stock ICS 4.04 (4.1.B.0.431), lost my root (and looks like i also lost CWM recovery), can't flash anything and can't root the phone again.
So, would anoyone know how to fix this? Please, keep any instructions as easy and clear as possible. As you'll probably see in the rest of my post i'm pretty new/noob at this stuf.
Here are the things I did to get to this point (before all this I started out with ICS 4.04 build 4.1.B.0.587)
- First I unlocked my bootloader, that seemed to work. I followed the steps on the sony instruction page
- Second, I rooted the phone, by following a combination of the steps in this thread: http://forum.xda-developers.com/showthread.php?t=1683957 and on another non xda page (the steps seemed similar, but the non xda page was a little clearer/easier/more noob friendly for me.) That also worked, since I could use Titanium Backup (can't now)
- Third, I installed CWM with RecoverX. That worked, since I could enter CWM.
- Fourth, I tried installing different ROM's (cyanogenmod) by storing it on my sd card and installing it via CWM. That's where the problems started.
First of all I couldn't install any of the ROM's i tried. CWM would start installing it and then gave a status 7 error and aborted the installation. After trying the same process a couple of times my phone got stuck on the Sony screen after rebooting.
To fix this i flashed a stock android thingy (not sure if it's a rom, kernel, or whatever, anyway it's the version i'm running now) That worked and my phone at least functioned again.
However, since I don't wanna run this version I looked for ways to flash/install a different one. That's when I noticed I lost my root (an app i dl'ed that needs superuser privilleges didn't work) I tried rooting the phone again, but found I couldn't even flash anything. If i tried that, flashtool would give an error about not recognising the phone and stopped the flashing process. Then i tried to unlock the bootloader again, to see if that might work. But that didn't work either cause again my pc didn't seem to recognise the phone. I also tried using the doomlord root app. That seemed to work, but somehow after finishing it i didn't end up with root priviliges (again, I checked this by trying to use a root required app)
So, now I can't unlock the bootloader, I can't flash anything and I can't root my phone. All I can do is use it. And thought that's obviously the most important thing, I would like to be able to do more with it.
So, does anyone know how to fix this? It all seems to boil down to my phone not getting recognised while in fastboot/flash mode. But I wouldn't know how to fix that...
A lot of thanks in advance for any help!
Click to expand...
Click to collapse
1. Why did you use XParts? Unlocked bootloader means you can flash a stock kernel with CWM in it.
2. CM ROMs use different kernel, that's why you get status 7. Maybe you can Google a bit on CWM status 7 error? To install Cyanogen ROM, use the included kernel or look for a list of recommended kernels.
3. Flashtool should still work. Can you enter flashboot? Connect your cable to the PC, hold down the back button and connect your cable to it. A blue light means it's successfully connected in flash mode.
僕のLT18iから送られてきた

Thanks both for the different bits of advice. I dunno how, but it finally works now! In the end I installed sony's pc companion, switched off antivirus and then all of a sudden i could flash things again. Then i just followed the steps to rooting the phone for the second time, and it finally worked. Got my root back and also managed to install a ROM from CWM.
Again, not sure how, maybe i should have just turned off my antivirus from the start, or maybe in retrying all the steps I somehow stumbled across the sollution, but at least it works now
popthosegaskets said:
1. Why did you use XParts? Unlocked bootloader means you can flash a stock kernel with CWM in it.
2. CM ROMs use different kernel, that's why you get status 7. Maybe you can Google a bit on CWM status 7 error? To install Cyanogen ROM, use the included kernel or look for a list of recommended kernels.
3. Flashtool should still work. Can you enter flashboot? Connect your cable to the PC, hold down the back button and connect your cable to it. A blue light means it's successfully connected in flash mode.
僕のLT18iから送られてきた
Click to expand...
Click to collapse
What is XParts? I don't think i used that program. The steps i previously followed might have been redundant in part, but I wanted to be on the safe side and just try all options i could find.
I tried googling for the CWM status 7 error, but couldn't really find any sollution i could work with. And anyway, it's fixed now (i hope, didn't try CM again though)
Flashtool didn't work yesterday. Or at least, it did work but i just couldn't flash anything cause it didn't recognise my phone.
Anyway, thanks again. This is fixed now

ilporro said:
Hello,
First of all, I did try to look for other topics about this issue. However, working through sometimes a couple of hundred pages in a thread and to sift through all the topics here could mean I missed something.
Click to expand...
Click to collapse
Which is why senior members in all sections create guides like - [GUIDE] All Things XPERIA - Debranding - Rooting - BL Unlocking - Theming to make it easier for People like yourself, and in those guides you'll find things like...
XperienceD said:
Rooting:
UPDATE: One click root [4.1.B.0.587 /.431 /.562 ] All 2011 Xperias
- What is rooting and why should I do it? The pros & cons of Android rooting
Rooting methods for the XPERIA line of Phones has constantly changed from apps to Pre-Rooted ROMs and Kernels. A Google search of "root -insert device name-" should help to find the specific method for your Phone but the following link is well worth reading - [How-To] Rooting guide for 2011 xperia devices
References:
[Arc/S] [PRO] Root for 4.0.4 ICS Update [4.1.B.0.431+4.1.B.0.587]
Root MANY ANDROID! [Upd: 18.12.2012]
[ROOT+BB+CWM] ICS and non rootable GB build
[ROOT][NOOB GUIDE][for unlock BL] For Official ICS 4.0.4
[HOW-TO][FTF] Root and CWM with the latest 9.0.1.D.0.10 firmware
[ROOT&MORE]Xperia 2012 line Flashtool + prerooted system.img + Sony fw FTF + addons
[Tutorial]Root.Xperia 4.0.4 ROM [all h/m(dpi)] | 4.1.B.0.431
Click to expand...
Click to collapse
...so when a new members start new threads about something that's been covered a gazillion times, it can be quite frustrating.

XperienceD said:
Which is why senior members in all sections create guides like - [GUIDE] All Things XPERIA - Debranding - Rooting - BL Unlocking - Theming to make it easier for People like yourself, and in those guides you'll find things like...
...so when a new members start new threads about something that's been covered a gazillion times, it can be quite frustrating.
Click to expand...
Click to collapse
Well, I did follow the steps in at least one of those guides. And that worked. So the problem wasn't in working out how to root the phone, but in fixing what went wrong afterwards. The first attempt at rooting worked, but then flashing a ROM failed, the phone stopped working and after fixing that i lost the root and couldn't find a way to reroot it (even ater following all the steps in the guides i previously used, it just didn't work)
So, with all do respect to those guides and their usefullness, as far as I can tell my problem/question wasn't answered in them.

[SOLVED] [Q] Help - getting stuck on boot screen after trying to revert from JB to GB

Hi guys.. I tried installing jelly bean on this device (i8160p and it's not mine) using odin and a stock 4.1 rom I got from samsung updates(I have no root and I went from a never-touched stock)... All went fine, It's working and has all the features. Except that now its owner is asking me constantly to revert back to the original os, since he did find 4.1.2 very slow. So I went back the same path as in the first place in an attempt to get the original gingerbread : I downloaded a stock 2.3 from the site and then tried flashing it.. All again went smooth, with no problems, until I got stuck on the bootscreen and noticed that there was no way to access recovery(download mode working fine though)... So what I'm left with now is a non-booting gingerbreak or the possibility to stay in jellybean(flashing it still works), I'd prefer if I could go back to GB; I think the problem is that there was some conflict caused by jellybean which will require a reset that I can't of course do since I can't boot into recovery, and I don't see any way to install a custom recovery. So can this be done any other way, I'm afraid I'll break this phone before I'll even come up with anything since this is my first experience with roms and boot on an android;
info : as I mentioned There is no root (for now. I might however get into that from jellybean, but I'd rather not if it's possible) and the model is i8160P . an emphasis on the P here since it's the reason I can't find any custom roms, and all I'm left with is the stuff in here
Edit : got gingerbread back after following what angrybb has suggested

Flash the working JB, and after that root your phone like here: http://forum.xda-developers.com/showthread.php?t=2139263 Reboot to recovery and after that follow the howto: http://forum.xda-developers.com/showthread.php?t=2352064 just in step 8 use original gb firmware.
If you can't get adb root access from stock recovery then flash kernel with cwm, for jb for example this: http://forum.xda-developers.com/showthread.php?t=2304432 or this http://forum.xda-developers.com/showthread.php?t=2171054
After flashing one of those kernel, again follow: http://forum.xda-developers.com/showthread.php?t=2352064 , again in step 8 use gb fw

Ok I'll see
Thanks man I'll try what you suggested as soon a I can...
I have a question though: now I noticed that some people fixed this issue by dowloading some other parts (.pit and something else), but of course I'm unable to find these for the model with the P... Now If someone can please tell me if these files have anything to do with the re-partion option in odin(I heard that it does format everything and not just put things on top of things).... Is using it safe given that I don't mind losing data, or should I stay away from it ?
For angrybb : the phone still shows as i8160p in the about section and has access to network...

Here there is a lot talking about pit files, some tehniques with flashing one fw after another, but with no real explanation why this should be done this way. I dont like doing things like that, i want to understand what i am doing. I still haven found some in depth info about pit files.
Anyway, i upgraded from GB to JB with kies, after that i compared some parts of fw and pit file is not changed. Pit from GB and JB have same md5 in my phone, so it is the exactly same file.
I know that method i suggested is not short and plain easy but it is tested and working.

Thanks
Sorry for the delay... For anyone with same problem just follow what angrybb has suggested, but do not under any circumstances ignore backing-up CSPSA_FS and MODEM_FS if you care about your phone's ability to make calls !

hey, maybe you guys could also help me out? i came from a custom ROM that i was having problems with so I wanted to go to an official ROM instead. Originally i came from a GB stock ROM, then i went straight to CM 10.1 but i didnt have any signal on my phone so i tried flashing original stock 4.1.2, now im stuck on the boot screen and i cant access recovery mode. please help?
P.S. my phone is i8160

[Q] Help with installing a ROM.

Hi all
Hopefully someone will be able to help me here as have spent all day going round in circles and finally decided I need to stop stabbing in the dark and ask for help from people who know what there doing.
My son has a Sony Xperia M (C1905). He's always running out of space with all the games he likes to play on it so I thought I would move them to a removable 8GB SD card for him. After downloading and installing a app that should have allowed me to move them I was still unable to so I did a Google and found out that its not possible with this phone with out rooting it.
At this point I started looking into how to do it and found out I needed to unlock my boot loader. I used this site (developer.sonymobile.com/unlockbootloader) to get the code required and used the code in "Sony Mobile Flasher by Androxyde V0.9.18.1" to unlock it with out any problems. When I restarted the phone it would get stuck on the operator logo (Three UK) no matter how many times i restarted it or pulled the battery out.
Since then I have tried various different ROMS for the Xperia M, both installed via the CWM (zip file) and via the flash program (ftf file), also I have tried a few different versions of the CWM. All of this has got me no closer to getting the phone working again. I either get errors while trying to install the ROM or it installed fine and just goes into a boot loop.
I don't believe I have bricked the phone as I can still do everything on it (flash more, fastboot mode, format etc in CWM) i just cant get the phone to boot up correctly. Also drivers are installed on my pc fine so dont think its a problem with that either. I do think it cold just be not using the correct ROM, CWM, KERNEL?
Would someone please be able to help me out here and give me a step by step guide of what I need to do (in simple terms) along with what files to use. I'm not after the latest Android version as long as its a recent version, the only thing it has to be able to do is move apps to the SD card.
Thanks in advance for any help.

Hi,
You will need to flash the phone with the stock firmware.
Here is the topic that explains how to do it using Flashtool and also contains links to the firmware: http://forum.xda-developers.com/showthread.php?t=2697277
Once your phone is unlocked, you can follow this topic to install CM11 on your phone: http://forum.xda-developers.com/showthread.php?t=2584956
and lastly, this tutorial will help you use your SD card as an internal storage: http://forum.xda-developers.com/showthread.php?t=2711280&page=2

Thank you so much for your reply.
I was just coming to say that I had somehow managed to get CyanogenMod 11 rom installed and working fine (all be it with a lot of apps like play store etc missing. Do i have to install them after?)
ill have a look at the links you provided as well. thanks

mat.knott said:
Thank you so much for your reply.
I was just coming to say that I had somehow managed to get CyanogenMod 11 rom installed and working fine (all be it with a lot of apps like play store etc missing. Do i have to install them after?)
ill have a look at the links you provided as well. thanks
Click to expand...
Click to collapse
If everything is working properly then you just apply the topic on the swap (last point of my first post), there are several method for each variant (which is on stock rom or CM11)

[Q] Please help! Severe troubles when installing new ROM!

I have a specific problem .. I think in order for anyone to understand it, I have to explain it well.
I was flashing the new LegacyXperia ROM on my Xperia Arc S (http://forum.xda-developers.com/showthread.php?t=2545354) .. before, I had an older version of LegacyXperia already installed, with CM10.2.
Anyhow, I forgot to flash the boot.img! I did everything else as I should and istalled the ROM. Yet now when rebooting the phone from recovery, it only gets to the "LegacyXperia" screen (I don't know how this is officially called .. it's the first screen you see) and not further. Well, if I press the home button when it's starting, I get to recovery mode. .. So I've been trying my best to fix this. This includes:
Currently I have another Arc S device to work with - I have made a backup through recovery on that device (which works perfectly, running a different ROM) and tried to run it on the "broken" device .. recovery said it went well, but when starting the phone, nothing changed.
I've tried installing a different ROM (the one that is also installed on the second device), but again nothing changed.
I've tried wiping pretty much everything but the "dalvik cache" (since I don't know what this particular cache is) and installing the different rom and/or using the backup. Nothing made a difference.
I've even made an attempt on install the forgotten boot.img - I've taken the previously mentioned backup, put the boot.img into it (all that was on the SD card, via my computer, of course), and added the md5 values to the md5 file. Well, my phone was giving me a md5 mismatch, so I tried wiping everything off the md5 file, which seemed to do the trick (this is a useful thing to know!), since I was able to go through with the process of recovering the boot.img through recovery. After I've managed that, I've reinstalled the LegacyXperia ROM as I should have in the beginning. Yet again, nothing changed! the phone still won't start!
I am really desperate and out of ideas. ..the only idea I have left is try to install an older version of legacyxperia (the one I probably had before) .. but since installing a completely different ROM didn't work, I have only little hope..
I was not able to get into fastboot .. I do not know if it's enabled or not, since it was not me who installed the previous ROM on my phone. I know, shame on me ..
I hope I wrote down everything one could need in order to help me. And please do help me, I ran out of ideas and would REALLY hate to loose this phone!

I didn't understand the part of adding MD5 values to the MD5 file, but whatever
I don't really see why the rom wouldn't boot up, unless the kernel just isn't being flashed. (Maybe the previous owner relocked the bootloader?)
Can't you fastboot the kernel?
Also, Dalvik Cache can and actually should be wiped when installing a new rom.

SOLVED
Yeah, I got the feeling the kernel didn't flash, too! .. perhaps the bootloader was re-locked, but I really don't see why one would be doing that..
I was trying to get to the fastboot screen (with all the button-pressing and usb-plugging), but didn't manage that. However, I found a solution! (and god bless the guy who put this up!) I followed this thread [it seems xda-developers won't let me post an outside link .. anyhow, it's a thread on androidgadgematic.com, titled "How To Fix Bricked Sony Xperia Android Phone With Flashtool [ Unbrick ]" from june 17, 2012] and managed to install the stock ROM without much trouble. Now the phone is again running nicely I did, however, have to get a seperate driver package, since the one supplied with the flashtool wouldn't instal - I googled the drivers and used version 1.5 from xda-developers' forum.
GOSH I'm glad this is over