Root & Restore Questions Optus Branded Galaxy S2 - Galaxy S II Q&A, Help & Troubleshooting

Morning All.
Recently purchased a Galaxy S2, and love the phone. Upgraded from HTC Desire. and a couple of questions in regard to rooting as its a different process.
Is there a way to create a backup of the phone in its original state, so I can restore if necessary, eg ido something stupid and the phone falls flat?
Also, with the desire I used to install custom roms using Clockword mod, is the same available in the Galaxy S2?
Interested in rooting the handset to get rid of the optus crap, and install themes, boot animations, roms etc.
I saw this for rotting and would like to know success rate for this method, as its quite different to the desire.
http://forum.xda-developers.com/showthread.php?t=1103399
Any help appreciated.
Cheers
Glen.

I have an optus SG2. First thing i did was root it to give super access. Then i flashed it with KE7 to debrand to get rid of the optus bloatware. I found a link somewhere to download the optus stock rom incase something happened. Also bought myself a USB jig to reset counter and to get rid of the triangle.
So far so good. Just playing around with themes (changed to blue), new camera and phone mods. I am thinking about going litepro but unsure if my titanium backup will be able to bring back some of the apps after the flash. Still waiting for an answer in one of the posts.

porkchop8 said:
I have an optus SG2. First thing i did was root it to give super access. Then i flashed it with KE7 to debrand to get rid of the optus bloatware. I found a link somewhere to download the optus stock rom incase something happened. Also bought myself a USB jig to reset counter and to get rid of the triangle.
So far so good. Just playing around with themes (changed to blue), new camera and phone mods. I am thinking about going litepro but unsure if my titanium backup will be able to bring back some of the apps after the flash. Still waiting for an answer in one of the posts.
Click to expand...
Click to collapse
How did you perform the root?
Also, where did the optus stock rom from? Have a copy of it?
Cheers

i followed this http://forum.xda-developers.com/showthread.php?t=1056334
The optus rom is about 350mb. I dont have the link. I was searching around whirlpool and found it.

Optus branded Samsung Galaxy S2 applications/software
Glen C said:
Morning All.
Recently purchased a Galaxy S2, and love the phone. Upgraded from HTC Desire. and a couple of questions in regard to rooting as its a different process...
Click to expand...
Click to collapse
Hi Glen,
I just received SGS2 yesterday that I bought on eBay and this mobile should be (description says)Optus branded. But I cannot see any Optus software on it. There are only 2 extra aplications - navigation from Navigon and Good Food Guide 2011. So I think this phone has no Optus bloatwares at all.
What Optus applications/software can you see on your phone?
Thank you for your answer.
Petr

Any chance of posting the Optus stock rom ?!

im trying to restore to optus
if someone can please make a backup of their optus rom before flashing please post a link
i have one from a guy from whirlpool but its missing boot.img
so the restore just wont follow through

Same with Gtda, I need the stock rom, and the rom with Optus out atm doesnt have a boot.img, a new 'stock' rom would be sweet!!

Any one at all? Would using a boot.img file from another back up work even tho it won't display the optus boot picture
Sent From My iphone Killing Galaxy S II

Having massive reception problems so I have had to flash back to the original Optus Rom from Litening Rom and am sending the handset back to get the thing checked out. I followed the following and everything is back to stock. I also used a reset jib to reset the counter.
http://forum.xda-developers.com/showthread.php?t=1075278&highlight=root
Hope you get it sorted out?

Related

[Q] Rollback GS2 to GB 2.3.4 from ICS 4.0.3

I have a new unbranded Samsung Galaxy S2 from Carphone Warehouse on Orange.
Baseband: I9100XXLPS
Kernel: 3.0.15-I9100XWLP7
Build No: IML74K.XWLP7
It came with Gingerbread 2.3.4 and I loved it. Having plugged it into Kies for the first time and accepted the software update it is now on ICS 4.0.3. I like absolutely nothing about this version and have tried to roll back to GB 2.3.4 using Odin and the link to my version of CPW firmware from skywanker.net. I was under the impression because the phone came with 2.3.4, the flash would roll back to this but it hasn’t. It is still on 4.0.3. and having now found my way to the new list of firmware on Android.firmwares.net I can see that it lists this download as 4.0.3.
Can someone please tell me how I can find a GB 2.3.4 suitable for my CPW XXLPS phone so I can roll back to the stock version it came with?
It is not rooted. I don’t want to root it I just want it as it was out the box and still under warranty!
Please help. I have spent literally days and days trying to find this answer after having plucked up the courage to flash my phone with Odin and I am so disappointed that all I’ve done it put 4.0.3 back on it!
I have spoken to CPW, Orange, Samsung and CPWs Geek Squad and come up blank!
Thank you ;o)
Tried samfirmware.com ?
Thanks for such a quick reply B3311. I've looked up the firmware for my PDA at samfirmware and it is also showing as ICS 4.0.3. This is what I find so confusing. My phone shipped with GB 2.3.4 so why can't I find that anywhere to download and roll back?! Any other suggestions?
http://www.hotfile.com/dl/150009521/71118c0/I9100XWKI4_I9100XEUKH2_XEU.zip.html
you could try this one. official 2.3.4 filed under europe, united kingdom/ireland.
or this one europe, open europe official 2.3.4 firmware
http://hotfile.com/dl/145783246/da10e07/I9100XXKH1.zip.html
Search again at sammobile, you will find the 2.3.4, if you can't search, no one can help.
Hint: Look in Europe
Don't forget to wipe
Before and after flashing.
Look at 2.3.6 aswell if you want.
Sent from my GT-I9100
Will these downloads be compatible with my phone and if I load them would they void the warranty? If anything goes wrong could I just load the 4.0.3 again via Odin? Sorry for so many questions but I have no experience of this sort of thing. I don't even download apps to use - I just like the standard stock function of the phone - or rather I did before ICS!
yeah i understand what you mean ics is pritty buggy and not as good as gb yeah they should work just fine like anything to do with flashing tho its not 100% safe. just download and flash away but take your time
Flashing stock, unrooted firmware will not void your warranty.
May be worth knowing that 2.3.4 is an older version of GB. 2.3.5 and 2.3.6 are newer, and "better" (IMO).
I'm on 2.3.6, and have no intention of moving (I will not call it "upgrading") to ICS until I get the SGS3 next month.
ratdroid said:
Will these downloads be compatible with my phone and if I load them would they void the warranty? If anything goes wrong could I just load the 4.0.3 again via Odin? Sorry for so many questions but I have no experience of this sort of thing. I don't even download apps to use - I just like the standard stock function of the phone - or rather I did before ICS!
Click to expand...
Click to collapse
it depends you flash the same FW, if your dealer finds the firmware version on the phone is not the same when it was supplied , they may deney waranty...so its upto you to find the exact version and flash...
wrong....if some thing went really wrong and gone to unrecoverable stage you cant load 4.0.3 back
Normally there is nothing going wrong if you have followed the steps correctly and carefully....
atifsh said:
Search again at sammobile, you will find the 2.3.4, if you can't search, no one can help.
Hint: Look in Europe
Don't forget to wipe
Before and after flashing.
Look at 2.3.6 aswell if you want.
Sent from my GT-I9100
Click to expand...
Click to collapse
All I've been doing for the last 7 days is searching, searching, searching. I can assure you I have tried to sort this problem out before posting here so please don't suggest that I can't search! Just because my level of expertise in all this is zero - doesn't mean I'm not tyring to learn and help myself!
I am not one to customise the phone so I am very wary of what I am doing to it. I am trying to ensure that I don't make matters worse for myself. I had searched samfirmware according to the criteria of my phone that they requested and it returned only the 4.0.3 option.
I have now found the list for older firmware and can see that there are some 2.3.X under Europe, but my next question is - how safe is this to use with my phone. I was under the impression from the XDA guidelines for flashing with Odin that you should only use firmware that is compatible with your own PDA, Phone and CSC. Will it void the warranty if I put something for Europe on there or cause issues with the function of the phone?
Also - I'm afriad I don't know what you mean by "wipe" the phone. Do you mean do a factory reset?
Go here and find GB Version you wanted.
http://samsung-updates.com/gt-i9100-galaxy-sii/
Thanks for everyone's input so quickly!
I've had a good look at the list on Samfirmware and I'm guessing my best option is to try the one for GB 2.3.6 for UK (Orange). I will give it a go.... watch this space!
angelshie said:
Go here and find GB Version you wanted.
http://samsung-updates.com/gt-i9100-galaxy-sii/
Click to expand...
Click to collapse
That link provides a very comprehensive list of firmware for my version of phone, but still not the GB 2.3.4 it was shipped with! This is exactly why I'm so confused; I just find it so odd that there is no way to find the orignal firmware for this PDA. Does anyone know if this a common thing with Samsung phones and firmware?
jonnyhall1bmx1 said:
yeah i understand what you mean ics is pritty buggy and not as good as gb yeah they should work just fine like anything to do with flashing tho its not 100% safe. just download and flash away but take your time
Click to expand...
Click to collapse
I keep kicking myself for allowing the update to run! I'm just not up to speed with smartphone tech I'm afraid, but I never allow major updates onto my computer until they've been around a while and all the bugs fixed which is why I am so angry with myself for not being clued up on ICS!
If I'd known about the ICS changes, I'd have stuck with GB for the cute android emoticons in SMS alone ICS has really mucked up my phone and the way I use it. I have no idea what possessed them to release firmware that has removed such useful basic functionality from so many everyday things. And as for the signal and battery problems - that's a rant for other existing threads!!!
I had an intereseting convesation with Samsung Tech though - it seems they are very aware just how buggy ICS is and the issues it's causing as they told me I'd have to send my phone back for a hardware repair if the battery life didn't improve. If this rollback doesn't work I can only hope they release a fix very quickly.
The GB 2.3.6 is slowly downloading so hopefully I’ll be able to give it a go later today. Doesn’t help that I live in the middle of the Fens in Huntingdonshire so am surrounded by beautiful country but only 2mb broadband. AGH!!! Some days I really miss cable
Disaster! Got GB 2.3.6 OK - but it's all "orangified"! Should have realised that but thought because I'm on orange that would be the right one. So now I'm downloading the 2.3.4 for UK / Ireland as orignally suggested by jonnyhall1bmx1. I'm hoping this one will be totally open and not linked to any carrier.
See what happens when I let my brain get involved!!!
ratdroid said:
Disaster! Got GB 2.3.6 OK - but it's all "orangified"! Should have realised that but thought because I'm on orange that would be the right one. So now I'm downloading the 2.3.4 for UK / Ireland as orignally suggested by jonnyhall1bmx1. I'm hoping this one will be totally open and not linked to any carrier.
See what happens when I let my brain get involved!!!
Click to expand...
Click to collapse
since your phone is already unbranded, no need to be on a carrier ROM, search for XWLA2 or XWLA4 which is the latest versions of 2.3.6, may be released for some country name (italy ) doesnt matter...
Good for you that you search, I don't intend to make fun or insult, just that search function works and it's better to get some knowledge before hand instead of relying 100 percent on others.
Now, yes flashing using Odin is safe, as you have experienced now. La2 is the best I found and I always go back to it when required.
Yes wipe means to clean data cache.
Wiping do erase your stored files on internal storage. So remember this.
Always good to do this after and before every flash.
Dial code to wipe *2767*3855#
Sent from my GT-I9100
Try this tutorial:
http://androidadvices.com/update-samsung-galaxy-s2-gt-i9100-gingerbread-xxkg1-234-firmware/
If you want to go to 2.3.6, read this post:
http://www.androidquestions.org/thr...ght-Can-t-browse-without-WIFI?p=1264#post1264
Rob.
(a newbie)
Well I'm absolutely delighted to report that the last firmware flash has done the trick. I'm back onto GB 2.3.4 and all the functionality that I liked is back and the battery and signal strength already improved. What a huge relief! Thanks to everyone who posted here to help me. This is a great forum and it has encouraged me to be more confident with my phone and its functionality in the future.
I sincerely hope this thread will help others out there to rollback from ICS if they have the same issues I did. Ciao for now folks.
Hi,
I would like to thanks to all contributors to this thread.
I also want to rollback to 2.3.6 from 4.0.3 and I own an orange branded galaxy s2.
I've found the necessary firmware from sites posted here (I9100BVKL1_I9100OROKL1_I9100BVKL1_HOME.tar.md5).
Also, I've understood that I need only Odin for this operation.
I would like to have just a confirmation from you guys, if the method mentioned here works in the same way on branded galaxies (orange specifically).
Thank you,

Unlocking and unbranding a Sgs3 on the 3 network UK

Is this easy enough to do. Got the chance of buying one at £400 but would need to unlock it and preferably have it unbranded.
Is the unlocking part something I could do myself or would I need to take it to a vendor and how much would it cost?
Thanks.
The 3 phones are unlocked already
It costs £10 on ebay for an unlock code
Easy enough to un brand by flashing a stock firmware .
But i would wait until i had a copy of my original firmware first in case of claiming on 3 warranty .
jje
AMoosa said:
The 3 phones are unlocked already
Click to expand...
Click to collapse
As the man said three are unlocked, so just flash a stock samsung rom and it will be unbranded
johnbhoyc said:
Is this easy enough to do. Got the chance of buying one at £400 but would need to unlock it and preferably have it unbranded.
Is the unlocking part something I could do myself or would I need to take it to a vendor and how much would it cost?
Thanks.
Click to expand...
Click to collapse
Mine is on Three and unlocked/unbranded (although I did get it via Carphone Warehouse) so your mileage may vary.
R.
I had a 3 UK phone, I got it since the launch, as I had it pre-ordered, and it arrived locked, however I used the Voodoo SGS III Unlock Tool and it worked brilliantly, it is free to download and it unlocks it almost instantly, however ROOT is required.
For the information of anyone reading this thread, in branding is as simple as flashing a generic official rom from your country via Odin, takes 5 minutes.
Unlocking is done via the methods shown here in the forum and is free, again, takes 5 to 10 minutes.
To undo the changes, flash back to the carrier ROM you had originally, and I wouldn't worry about undoing the unlock.
Sent from my GT-I9300 using Tapatalk 2
Use supercurio's galaxy s3 unlock tool from market,its free
Could anybody with a more in-depth knowledge care to offer a bit more info on this?
I currently have an O2 branded S3.
I have rooted this (when I first got it) and that went fine (Odin, I think was the method I used).
If I wanted to flash a basic unbranded image on this, would I use the very first post from this thread, labelled "I9300XXBLFB"
http://forum.xda-developers.com/showthread.php?t=1646610 (If not, could somebody point me towards the correct file please?)
Then, If I ever needed to put an O2 image back onto it, (maybe for warranty purposes) could somebody point out where I would find the O2 branded one, as I can only see an Orange branded one in the following post?
Also, is there actually much risk involved in the flashing, or would I be really unlucky for anything to go wrong?
(P.S. I've seen the thread about how to change the handset back to make it seem that it's never been flashed/modified, so I realise I'd need to do more than just flash the O2 image back onto it. Hopefully, I'd never need to anyway).
greatcapp said:
Could anybody with a more in-depth knowledge care to offer a bit more info on this?
I currently have an O2 branded S3.
I have rooted this (when I first got it) and that went fine (Odin, I think was the method I used).
If I wanted to flash a basic unbranded image on this, would I use the very first post from this thread, labelled "I9300XXBLFB"
http://forum.xda-developers.com/showthread.php?t=1646610 (If not, could somebody point me towards the correct file please?)
Then, If I ever needed to put an O2 image back onto it, (maybe for warranty purposes) could somebody point out where I would find the O2 branded one, as I can only see an Orange branded one in the following post?
(P.S. I've seen the thread about how to change the handset back to make it seem that it's never been flashed/modified, so I realise I'd need to do more than just flash the O2 image back onto it. Hopefully, I'd never need to anyway).
Click to expand...
Click to collapse
1st of all dial *#1234# into the dialer this will give you the current firmware version(im assuming your still on o2 firmware and havent changed it yet) then go to here
http://www.sammobile.com/firmware/?page=3&t=1&o=1&m=GT-I9300&r=1#regiona
this is s3 firmware version for europe and find the firmware that matches the 02 version your on. This is your fallback incase you need to warranty repair the phone or you maybe have a flash problem with unbranded at least you have the o2 to fallback on.
Ill assume its more than likely this one
http://www.sammobile.com/firmware/?page=8&view=4650
and heres the dl link for it
http://www.hotfile.com/dl/157417303/f25aa83/I9300XXALE8_I9300O2UALE5_O2U.zip.html
Then as youve already mentioned flash the LFB version, here ya go dl link
http://www.hotfile.com/dl/162402398/abc9bdb/I9300XXBLFB_I9300OXABLFB_BTU.zip.html
Now if you want any other versions of official firmware you will need to join sammobile to be able to dl them
Thanks very much for the reply.
A couple of issues having taken a look at those links.
The first link doesn't seem to have my firmware listed - some are close, but none the same.
Mine shows: AP: I9300XXALEF, CP: I9300BWLE6, CSC: I9300O2UIALE7
Would an alternative work if I ever needed to flash back? (maybe the one you've linked in the 2nd link?
And, finally, to confirm - the last link - "LFB" (not sure what that means) - is that the unbranded rom that I'd be looking for?
Many thanks for the advice.
greatcapp said:
Thanks very much for the reply.
A couple of issues having taken a look at those links.
The first link doesn't seem to have my firmware listed - some are close, but none the same.
Mine shows: AP: I9300XXALEF, CP: I9300BWLE6, CSC: I9300O2UIALE7
Would an alternative work if I ever needed to flash back? (maybe the one you've linked in the 2nd link?
And, finally, to confirm - the last link - "LFB" (not sure what that means) - is that the unbranded rom that I'd be looking for?
Many thanks for the advice.
Click to expand...
Click to collapse
Have your tried updating through kies 1st? As far as im aware you will still get o2 updates through it. I noticed my phone out the box(unbranded) didnt have firmware matching this list either but after a kies update I was on firmware more well known for the region and was on the list.
Yes the LFB is the latest unbranded firmware.
edit:- doing a bit of research it seems o2 branded phones are running the LE8/LE5/LE5 software so i think your missing an official update.
I've not really used Kies as yet. I'm running Mountain Lion on my iMac, & Kies won't install on that.
I can always use my lappy at work tomorrow to look into it.
If I was going to change to the unbranded firmware, I assume there's not really any point in using Kies to update the official O2 version on here at the moment?
greatcapp said:
I've not really used Kies as yet. I'm running Mountain Lion on my iMac, & Kies won't install on that.
I can always use my lappy at work tomorrow to look into it.
If I was going to change to the unbranded firmware, I assume there's not really any point in using Kies to update the official O2 version on here at the moment?
Click to expand...
Click to collapse
well it would confirm what firmware you need to download as your fallback firmware for o2
No point jumping forward then realising your not sure what o2 firmware u need in case anything goes awry
edit kies is available for mac
http://www.samsung.com/uk/support/usefulsoftware/KIES/JSP
SwiftSmoke said:
well it would confirm what firmware you need to download as your fallback firmware for o2
Click to expand...
Click to collapse
Oh, ok, fair enough. I'll give it a whirl tomorrow.
Is there much risk involved in flashing, or not much?
greatcapp said:
Oh, ok, fair enough. I'll give it a whirl tomorrow.
Is there much risk involved in flashing, or not much?
Click to expand...
Click to collapse
not really but nothings 100% guaranteed, so its always good to have backup plans in place just in case.
Not sure what backup plan I could have in place for me bricking the phone
Thanks for all your help. I'll look into it more tomorrow
Kies is, as you say available for Mac, but won't yet run on Mountain Lion. I'm assuming they'll update it soon.
You were right, Kies did update my O2 branded handset to the latest FW, which does show on SamMobile's site.
Phones from the three network are locked, carphone warehouse phones are unlocked as they're from the suplier.
Theres a tool called voodoo i beleive it's used for unlocking the sim on samsung phones, you should give that a whirl.
It's available on the market.
---------- Post added at 10:52 AM ---------- Previous post was at 10:50 AM ----------
greatcapp said:
I've not really used Kies as yet. I'm running Mountain Lion on my iMac, & Kies won't install on that.
I can always use my lappy at work tomorrow to look into it.
If I was going to change to the unbranded firmware, I assume there's not really any point in using Kies to update the official O2 version on here at the moment?
Click to expand...
Click to collapse
Root your phone and nand back up your rom.
Keep the back up on your computer.
Flash whatever you want and use the nand back up to restore if you need to.
Remove root and reset counter using triangle away if you ever need to send it back.

Why have I never been prompted about an OTA update?

Hi there,
I bought a galaxy S3 around launch day from Three. It was running their branded software (NELE4 or something like that) so I immediately just put on an unbranded UK firmware when it became available. so far so good.
But i'm confused as to why I've never been offered an OTA update when a friend of mine who also has an s3 direct from o2 gets them. I am currently on the very latest firmware thanks to the great man ODIN but i'd rather not have to do it this way. My phone is chainfire rooted by the way.
(Oh, and on a sidenote, I highly recommend three. Here in London i get 12mbps download speeds. sweeet!)
Thanks for the help
nickkyboy36 said:
Hi there,
I bought a galaxy S3 around launch day from Three. It was running their branded software (NELE4 or something like that) so I immediately just put on an unbranded UK firmware when it became available. so far so good.
But i'm confused as to why I've never been offered an OTA update when a friend of mine who also has an s3 direct from o2 gets them. I am currently on the very latest firmware thanks to the great man ODIN but i'd rather not have to do it this way. My phone is chainfire rooted by the way.
(Oh, and on a sidenote, I highly recommend three. Here in London i get 12mbps download speeds. sweeet!)
Thanks for the help
Click to expand...
Click to collapse
You have a choice XDA or official path .
Remove root flash your original rom and you may get updates OTA anything else is pot luck as you are probably showing wrong codes to the update server .
jje

[Q] desperate to roll back to original S3 stock rom

HI guys I lost my original Samsung gs3 stock rom, when I flashed a new Rom "checkrom evo v6" I'm a novice in operating android phones, I didn't have a clue about backing up and my warranty being void by customizing my phone. I have searched every website with the hope of downloading stock rom related to my phone to no avail.I'm in desperate need of having my phone unrooted and going back to the way it was. Pls respond in layman terms
chucky17ng said:
HI guys I lost my original Samsung gs3 stock rom, when I flashed a new Rom "checkrom evo v6" I'm a novice in operating android phones, I didn't have a clue about backing up and my warranty being void by customizing my phone. I have searched every website with the hope of downloading stock rom related to my phone to no avail.I'm in desperate need of having my phone unrooted and going back to the way it was. Pls respond in layman terms
Click to expand...
Click to collapse
Depending on your carrier/country, you may find what you are looking for here: at sammobile.
Sorry, I am newly registered here so cannot yet post links, so here is the butchered version wwwDOTsammobileDOTcomSLASHfirmwareSLASH
Red Hal said:
Depending on your carrier/country, you may find what you are looking for here: at sammobile.
Sorry, I am newly registered here so cannot yet post links, so here is the butchered version wwwDOTsammobileDOTcomSLASHfirmwareSLASH
Click to expand...
Click to collapse
Thanks for your response, first my region is ireland, and I did check Sammobile, the firmware link on the website seem to be for registered members only. Tried registering several times but for some strange reason it keeps failing. I would like to know if I could do same download through Samsung kiers and the difference between a stock Rom and a stock firmware? Thanks
chucky17ng said:
Thanks for your response, first my region is ireland, and I did check Sammobile, the firmware link on the website seem to be for registered members only. Tried registering several times but for some strange reason it keeps failing. I would like to know if I could do same download through Samsung kiers and the difference between a stock Rom and a stock firmware? Thanks
Click to expand...
Click to collapse
What is the name of your Irish provider?
gee2012 said:
What is the name of your Irish provider?
Click to expand...
Click to collapse
I'm on the 3IE network, and running the jellybean 4.1.1, I've it unlocked all these before I rooted my device.
Both 4.1.2 and 4.1.1 (and everything before that) are available on SamMobile for your phone.
I still can't post links so you'll have to de-butcher this, but that'll take you to a listing of firmwares for your country/carrier. Choose the one you want!
wwwDOTsammobileDOTcom/firmware/?page=3&model=GT-I9300&pcode=3IE&os=1&type=1#firmware
Sorry chucky17ng, I didn't read your post properly. For your purposes there is no practical difference between "firmware" and "ROM". And no, if you have rooted then Kies will bomb out saying your device has been modified.
Your best bet is to grab the firmware once your registration goes through (or source it somewhere else), drop the file onto your phone, then flash it with mobile Odin.
There are other ways, but I know that one works.
chucky17ng said:
I'm on the 3IE network, and running the jellybean 4.1.1, I've it unlocked all these before I rooted my device.
Click to expand...
Click to collapse
brother download here and flash via odin, be happy.
http://www.hotfile.com/dl/188225509/ea568b6/I9300XXELL4_I93003IEELL1_3IE.zip.html

[Q] Do I need unroot to get stock rom?

Hello everybody
I am new in this forum so please don't hate.
I hade S3 with orginal branded system but it was very slow so i wanted to get orginal rom without branding. I gave my phone to my uncle and he roted it and instaled TWRP (teamwin), galaxy apps and namless rom. This rom is a custom room and it has a lot of problems like: sometimes camera isin't working, widgets are invisible, galaxy apps weren' working (so i made a mistake and deleted it and now other google apps like YT aren't working) and there are a lot of another bugs. I have Odin and orginal version of non branded system from SamMobile. My question is do I need to do unroot before pluging telephone to pc and using odin or this is unnessery? I am new in xda and I don't now much about programing and stuff like this. So please help me!!
I would not use the image file from SamMobile to repair this issue. If you give me your exact model and serial off the sticker under battery, I can get you the Service files you need to COMPLETELY fix your issues.
And NO, your not going to need to unroot the device if you use the Service Files. It will under it for you!
Please let me know!
You can just flash the same rom over it to repair it.
You can flash with odin but im not 100% about debranding. If the phone is unlocked you should be ok using a btu (international) rom.
Make sure you know your efs version if you plan on flashing anything less than 4.3.
The answer to your question is no. You do not need to unroot but you WIll lose root.
Sent from a stolen phone!
The best way is to tell your uncle to restore stock firmware debloated.
Otherwise,find out your baseband version and model number and search xda for the CORRECT rom and flash it using ODIN.

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