Unroot/Factory Reset SGS2 O2 UK

[danlocke123]

Hi there,

I've ordered my n5 and so am preparing to sell my SGS2. It's currently rooted, on the stock firmware (I've done OTA updates since I got it new, so it has never had a custom ROM). I rooted it about 6 months ago, by flashing the Jeebo kernel following this guide. I now want to completely clean the device in order to sell it, but am a novice with Android, so am not totally sure how to do this correctly.

From what I can gather from sources such as:

this

and this, I need to download my stock ROM and flash using Odin.

As I stated in the title, the phone is locked to O2 (UK) and is the 16GB black model (if that makes any difference). I checked the CSC which is 'I9100XEULS5' and the PDA which is 'I9100XWLSW' and gather that I need the corresponding file from here (I have started downloading 'XEU-I9100XWLSW-20130530173418.zip', is that the right one?). My confusion is also coming from the fact that my device is locked- on the blog post I linked, people in the comments were mentioning needing unlock codes after following the guide... I was wondering whether it would be best to just unroot by flashing a new kernel or using the 'OTA RootKeeper' method which I have seen elsewhere, but am not sure if this is the way to do it.

Can someone please point me in the right direction?

Thanks,

Dan

 

[Anino4]

Go to the samsung website , there should be a android downgrade update. Put it in your sd card and go to recovery mode and flash it . It should be running a lower version of android but then a ota notification should appear . There'll be no signs of root . Good Luck ! Hope it works

 

[danlocke123]

Go to the samsung website , there should be a android downgrade update. Put it in your sd card and go to recovery mode and flash it . It should be running a lower version of android but then a ota notification should appear . There'll be no signs of root . Good Luck ! Hope it works

OK, can you help me find it? I had a look on the samsung website but couldn't find the downgrade update thing :-[. Also will this definitely work on a SIM locked phone?

 

[danlocke123]

I've had a look around on here and XDA, and it looks like my phone is unbranded (it is, however, sim locked to o2 uk). As I said I downloaded this: XEU-I9100XWLSW-20130530173418.zip' but now I'm thinking I need this: 'I9100XWLSW_I9100XEULS5_XEU.zip'. On XDA, the info next to this ROM states:

Base Firmware: I9100XWLSW (4.1.2)
Region: Europe
Country United Kingdom
Carrier: Unbranded
Build Date: 15 May 2013
Modem: XXMS2
CSC: XEULS5
Change List: 1211311

My modem, CSC and phone all match up with that, so I'm assuming this is what I need to flash, not the one I originally posted

 

[Anino4]

Just look up the updates to the model # of your phone . I'm pretty sure you flash the zip that goes with your phone lol

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