UNSTABLE Galaxy S II after root :( - Galaxy S II Q&A, Help & Troubleshooting

Hello guys,
I have just bought myself a Samsung Galaxy S II from Komplett.no:
http://www.komplett.no/k/ki.aspx?sku=631205#extra
Product Number = GT-I9100LKANEE
I have been using a HTC Desire HD and wanted to get all my data from that phone to my new Galaxy S II. A friend of mine told me to root both phones and use Titanum Backup to backup all data from my HTC and restore it on my new Galaxy S II.
Before I begun I updated my firmware through the update button on my phone, then started rooting.
I rooted my Galaxy S II with this guide: http://forum.xda-developers.com/showthread.php?t=1056334
Short summary: downloaded Odin3-v1.85 and XWKDD_insecure.tar. Set my phone to debugging mode, rebooted into download mode. Odin showed that is was connected. Pressed PDA button and selected the XWDD_insecure.tar file and pressed start. Phoen rebooted and it was rooted.
I got all my data restored from Titanum backup.
Then my phone started acting wierd. Suddenly no one could either call or send me sms. I had to reboot the phone several times to get it to work again. This was early starting to frustrate me and I started to google this problem and found no spesific solution.
I then started to wanting to reset my phone back to factory. Unroot my phone and reset all settings. I unrooted my phone again with SuperOneClick.
Then a new error started showing. I could not connect to any WLAN's. Tried resetting my phone to default several times without luck.
Then I started to look for the original firmware because now I want my phone back to normal as it was when I got it from the shop. I started to look for original firmware, thinking this would help. I have now tried severel firmwares (upgraded via Odin) but still having problems with WLAN and now also sometimes people can't call or send me sms.
This is really starting to get on my nerves And I REALLY wan't your help! I am a noob at this so maybe I have done something wrong?
I also get a message on KIES that the phone/firmware installed does not support updating. The firmware I now am using is as follow: I9100XWKI8/I9100XXKI2/I9100XXKI4/I9100XWKI8
Model number = GT-I9100
Android version: 2.3.5
Baseband version = I9100XXKI4
Kernel version = 2.6.35.7-I9100XWKI8-CL616395 [email protected] #2
Build number = GINGERBREAD.XWKI8
PLEASE HELP ME reststoring/resetting my phone like it was before I opened the case it came in. I DONT want the phone rooted, I now just want it as normal as it can be. Original state.

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First of all, what is your product code? The original should be on the box.
You can use that to search Intratech firmware thread. Flash via Odin and phone with USB debugging on and then connect to PC USB in download mode. Follow his flashing instructions and you should be fine.
Edit1: [ROM+Guide]Official i9100 Firmwares KG, KH1/2/3/4, KI1/2/3/4/8, KJ1/2/3 Download
Edit2: Use this website and use your prodict code to find your HIDSWVER; PDA / CSC/ Phone, then go to Intratech's thread and find the original firmware.Then flash.
Sent from my GT-I9100 using xda premium

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UpInTheAir said:
First of all, what is your product code? The original should be on the box.
You can use that to search Intratech firmware thread. Flash via Odin and phone with USB debugging on and then connect to PC USB in download mode. Follow his flashing instructions and you should be fine.
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
Thank you. I will try to look for the product code on the box when I come home!

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Check Edit 1 & 2 in previous post for added info. Hope it helps ......

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UpInTheAir said:
Check Edit 1 & 2 in previous post for added info. Hope it helps ......
Click to expand...
Click to collapse
Thank you so much! I will test that when I come home later tonight!
I'll let you know how it goes...

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Doesnt really matter what your original firmware was. As lonf as your phone the European and not US or Korean or something like that, pick up the latest firmware and kernel from the intratech thread and flash both as per the instructions there and root it using chainfires insecure kernel.
That ought to do the trick. It will wipe out all your data btw.

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I've just checked for you from the Product Code you supplied in your first post: GT-I9100LKANEE. If this is correct, you can flash the following firmware from Intratech's Thread. Use Odin (disable KIES) with the firmware button "PDA".
+++++++[Official Firmwares]+++++++
XWKI8
Firmware info
PDA:XWKI8
PHONE: XXKI4
Date: 28/09/2011
Android 2.3.5
NEE (Nordic Region): http://www.multiupload.com/XPF31ATMO4
---------- Post added at 09:16 PM ---------- Previous post was at 09:14 PM ----------
[/COLOR]
jayerfernandes said:
Doesnt really matter what your original firmware was. As lonf as your phone the European and not US or Korean or something like that, pick up the latest firmware and kernel from the intratech thread and flash both as per the instructions there and root it using chainfires insecure kernel.
That ought to do the trick. It will wipe out all your data btw.
Click to expand...
Click to collapse
Yes, that's correct. But he was after to returning it to how it was out of the box. . So I spent a little time to help him with the way forward.

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Ok, thank you! I have now done the following:
1) Set my phone to USB Debugging
2) Shut phone down
3) Connect it to USB on my PC
4) Started phone in Download Mode
5) Started ODIN (Run as Admin)
6) Clicked on PDA and browed to the file I downloaded (the file you mentioned over)
7) Clicked on START
8) Phone rebooted
Still having trouble connecting to WLAN and KIES is still telling me that it is not supporting upgrade!

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This is the latest build for your product code, so there won't be any until released for that particular product code.
You could try flashing an earlier Android version for your product code?
Take a look at Intratech's Firmware Thread again. The very first Official Firmware XWKDD . This may be Android version 2.3.3 .......very old
You will have to flash the stock kernel separately after the firmware.
Sent from my GT-I9100 using xda premium

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2nd Option: Root using Chainfire's CF-Root Kernel, with your latest installed firmware.
http://forum.xda-developers.com/showthread.php?t=1103399
Just flash his rooted stock kernel via Odin same as firmware. Done. Will give you root and a custom recovery CWM Recovery.
As wifi drivers are found in the kernel, you might like to try some custom kernels instead? Maybe you'll get better performance. You can flash custom kernels via CWM Recovery by placing on your sdcard and installing from zip from within recovery.
Edit: I believe this should be it?
XW_NEE_KI8: 2.3.5, CF-Root v4.3, SU 3.0.2, "insecure"
http://forum.xda-developers.com/attachment.php?attachmentid=743385&d=1318061076
If you do decide to give a custom kernel a try. I would recommend siyahkernel v2.2
Sent from my GT-I9100 using xda premium

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UpInTheAir said:
2nd Option: Root using Chainfire's CF-Root Kernel, with your latest installed firmware.
http://forum.xda-developers.com/showthread.php?t=1103399
Just flash his rooted stock kernel via Odin same as firmware. Done. Will give you root and a custom recovery CWM Recovery.
As wifi drivers are found in the kernel, you might like to try some custom kernels instead? Maybe you'll get better performance. You can flash custom kernels via CWM Recovery by placing on your sdcard and installing from zip from within recovery.
Edit: I believe this should be it?
XW_NEE_KI8: 2.3.5, CF-Root v4.3, SU 3.0.2, "insecure"
http://forum.xda-developers.com/attachment.php?attachmentid=743385&d=1318061076
If you do decide to give a custom kernel a try. I would recommend siyahkernel v2.2
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
Thank you! That kernel seemed to be the right one for me Now I can connect to the WLAN.
But what exactly do I need to do If I any time need service on my phone? Just unroot it with SuperOneClick? If I wanna use the warranty on the phone. Just a question.

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To return to stock, just flash your original "updated" firmware with Odin. This will also remove root.
To reset the binary flash counter and remove warning triangle (seen in download mode), search Ebay for "Samsung USB jig". It costs about $2 . Can also force the phone into download mode when phone is off, and if your phone is "soft" bricked. Well worth it, as I used it myself to return one SGS2 for warranty. You can make it too with old male micro USB plug and 301k ohm resistor.
Sent from my GT-I9100 using xda premium

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And my last question is, will I get the updates via the update in settings -> about? Or do I have to download the custom once from xda and flash my phone?

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Actually can't 100% remember.
90% think no updates. You can just download official from Intratech thread, he updates almost as soon as they're available, and flash via Odin. You will loose root though, so make sure there is a compatible CF-Root Kernel first.
Alternatively, try a custom ROM and kernel such as in my signature. CheckROM 3.1.1 (KJ3) & siyahkernel v2.2 kernel (governor - Smartassv2 with SetCPU app) . Can be highly customized, only if you wish, or stock look.
Custom ROM's are regularly updated by developers to latest build.
Sent from my GT-I9100 using xda premium

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I am still having trouble with my WLAN!
It worked great for a while, but suddenly it won't connect to WLAN's I have been connected to before Thought I had gotten a good working driver for my WLAN! The kernel is the same as when it worked.
Any tips and tricks?

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Hello again......Not good my friend
What kernel are you running, stock our custom?
Have you tried re-flashing the kernel separately to any firmware?
Do you have root again?
Do you have any issues connecting to any other network router, our just one?
Does any other device have connection issues with that particular router?
Sent from my GT-I9100 using xda premium

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UpInTheAir said:
Hello again......Not good my friend
What kernel are you running, stock our custom?
Have you tried re-flashing the kernel separately to any firmware?
Do you have root again?
Do you have any issues connecting to any other network router, our just one?
Does any other device have connection issues with that particular router?
Sent from my GT-I9100 using xda premium
Click to expand...
Click to collapse
I am using the following kernel:
XW_NEE_KI8: 2.3.5, CF-Root v4.3, SU 3.0.2, "insecure"
from this thread -> http://forum.xda-developers.com/atta...5&d=1318061076
Your second question is answered by the above answer that's a different kernel that did not come with the firmware.
Yes I have root
Yes, I have issues connecting to work and home router and there is nothing wrong with those since there are alot of other devices and computers connected to those WLAN's.

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Just had a thought.....
Try setting up your connection to the router with router settings "broadcast SSID" name visible, keep other security enabled.
I had a similar problem where my HTC DHD would not connect to router after reboot, but would only connect with SSID (router name) visible.
Sent from my GT-I9100 using xda premium

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I really don't think that will help anything. It has worked before I started rooting and flashing

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Mate, all I can think of is for you to try a very good custom kernel. Maybe have modified our better wifi drivers.
One I can highly recommend is;
[KERNEL] SiyahKernel v2.3 - "One kernel to rule them all" (SAMMY&AOSP ROMs)
http://forum.xda-developers.com/showthread.php?p=17583217
You can download for flash via Odin or CWM Recovery (from internal our external sdcard .zip)
Give it a try, sorry can't come up with anything else right now.
Sent from my GT-I9100 using xda premium