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[Q][GT-i9020a] How do I reflash back to factory?

Hi, new Android user here.
I was trying to root my Nexus S phone yesterday and I'm having problems. There is a lot of rooting guides out there and I used one from xda and also one from unlockr.com. Managed to root the phone ok (I think), but everytime I flash a custom ROM, the phone won't start at all, it just sits at the boot up screen and repeats itself.
So I'm thinking, I should just start over again. So I flash the stock ROM from xda back to 2.3.1. Everything seems ok, the phone starts up... but it's always stuck on airplane mode and the phone itself doesn't even show stuff like IMEI, mac address anymore.
So now I figure I've probably messed the phone up enough and need help lol. How do I go about reflashing the stock ROM and getting my Nexus back to out of the box condition (Stock ROM and no custom bootloader)?? Any guides or step by step instructions would be very helpful.
Thanks

Did you wipe before flashing roms?
Sent from my Nexus S c",)

Maybe flashing the KB2 modem would help that but the 9020a came stock with 2.3.3 and not 2.3.1 so that could be it...I'm not sure but that software wasn't meant at all for ours so it could be part of the problem. But if I was you I'd take a look at this thread wich has all the stock software for your phone. Make sure you wipe everything in clockework and then flash the stock rom. http://forum.xda-developers.com/showpost.php?p=13123996&postcount=39
dsixda uploaded the stock backup and the stock recovery, you can read more at that link, good luck hope it helps

You can download the full stock ROM from the link below:
http://goo.gl/8P8vl
Move the zip file to sdcard. Boot into recovery and flash the ROM. It should get you back to stock 2.3.4 ROM, all locked.

jungbum said:
You can download the full stock ROM from the link below:
Move the zip file to sdcard. Boot into recovery and flash the ROM. It should get you back to stock 2.3.4 ROM, all locked.
Click to expand...
Click to collapse
that did the trick. thanks everyone, now time to try rooting and flashing ROM again!
hrm lol now trying to update it to 2.3.4, it downloaded the update, but on reboot i get the white triangle with ! in it :\
this phone is so messed now
edit: well now everything is ok again, wiped data, flashed with CM7 and now it says 2.3.4, go figure.

[Q] CWM and stock recovery

Hello -- I'm new to the Charge but have a little experience rooting/flashing ROMS with Motorola devices. At this point all I want is a rooted device and everything else stock (2.2.1 firmware / EE4). To achieve this I placed the Superuser app zipfile onto my sd card, flashed CWM with Odin, booted into recovery and applied the zip update. Everything went smoothly, my device is now rooted and works fine. However, when I boot back into recovery I find that CWM is still installed, I was under the impression that this procedure would overwrite CWM with stock recovery when I rebooted. I don't really mind having CWM, just wondering if the fact that it wasn't overwritten is indicative of some other problem that is likely to bite me in the a** down the road.
Also, if all I have done is rooted and kept the kernel untouched, will I be able to receive the gingerbread OTA when it is released (if ever)? Or will I have to flash back to a stock Froyo ROM?
Thank you thank you thank you in advance.

talbot27 said:
Hello -- I'm new to the Charge but have a little experience rooting/flashing ROMS with Motorola devices. At this point all I want is a rooted device and everything else stock (2.2.1 firmware / EE4). To achieve this I placed the Superuser app zipfile onto my sd card, flashed CWM with Odin, booted into recovery and applied the zip update. Everything went smoothly, my device is now rooted and works fine. However, when I boot back into recovery I find that CWM is still installed, I was under the impression that this procedure would overwrite CWM with stock recovery when I rebooted. I don't really mind having CWM, just wondering if the fact that it wasn't overwritten is indicative of some other problem that is likely to bite me in the a** down the road.
Also, if all I have done is rooted and kept the kernel untouched, will I be able to receive the gingerbread OTA when it is released (if ever)? Or will I have to flash back to a stock Froyo ROM?
Thank you thank you thank you in advance.
Click to expand...
Click to collapse
What zip did you apply IN CWM?
Sounds like you applied a kernel too. Having CWM is not normal if you just flashed the superuser zip.
You will likely need to flash back to stock prior to updating with the GB OTA whenever it comes out.
_____________________________
Bloat frozen EE4 / Stock Kernel
V6 SuperCharger / Loopy Smoothness Tweak

Thank you for the reply.
The only zip I applied was the su-2.3.6.3-efgh-signed file downloaded here.
For CWM I flashed 0817_charge_recovery.tar.md5 found here.
Again I am now rooted but can still boot into CWM. After flashing the CWM file and disconnecting my phone, I initially fat-fingered it trying to boot into recovery and it rebooted. I then powered off and booted successfully into CWM to apply the zip file.
Any thoughts?

Ok, the main difference I see between my config and yours is that I may have used a different version of the superuser package.
The one at the link that you provided is superuser/su-3.0-d-signed.zip.
The one that I used is the su-2.3.6.3-efgh-signed.zip from here
You did start out from stock correct?
What is the kernel version in Settings->About phone->Kernel version?

Actually when I downloaded the Superuser zip file from the site I referenced it was su-2.3.6.3-efgh-signed.zip. This was a few weeks ago -- before version 3.0 was added.
My phone was absolutely stock when I got it 2 weeks ago and I have done no other messing with it. The Kernel version as it reads right now is:
2.6.32.9
[email protected] #1

talbot27 said:
Actually when I downloaded the Superuser zip file from the site I referenced it was su-2.3.6.3-efgh-signed.zip. This was a few weeks ago -- before version 3.0 was added.
My phone was absolutely stock when I got it 2 weeks ago and I have done no other messing with it. The Kernel version as it reads right now is:
2.6.32.9
[email protected] #1
Click to expand...
Click to collapse
Looks like you did the same steps that I did other than your extra boot into CWM. Usually, the stock init will check for the proper recovery, file systems, etc and then "fix" that which isn't right.
I have never seen it not do that before (I have had to reflash CWM several times before due to botching the 3 button bit)
_____________________________
Bloat frozen EE4 / PBJT Voodoo 0730
V6 SuperCharger / Loopy Smoothness Tweak

You cannot apply the OTA if you have CWM recovery. It will fail. Usually you need to have a fully bloated stock rom w/ stock recovery. Root is ok but you will lose it w/ the update

hoppermi said:
You cannot apply the OTA if you have CWM recovery. It will fail. Usually you need to have a fully bloated stock rom w/ stock recovery. Root is ok but you will lose it w/ the update
Click to expand...
Click to collapse
That's kind of why I chose this method to root, thinking that CWM would get overwritten when I rebooted -- but it didn't. Oh well.

talbot27 said:
That's kind of why I chose this method to root, thinking that CWM would get overwritten when I rebooted -- but it didn't. Oh well.
Click to expand...
Click to collapse
Enjoy it. I like CWM much better than stock recovery ;-)
_____________________________
Rooted and Bloat frozen Stock EE4
V6 SuperCharger

unroot confirmation

hey all, currently have a g2x rooted with cm7, and i've been looking to unroot;
just to make sure i dont do anything stupid, i wanna run this through with you guys:
first i would flash the stock 2.3.3 ota rom for g2x
then use the http://forum.xda-developers.com/showthread.php?t=1056847 (one click nv flasher) to get back to lg stock recovery by clicking 'flash stock recovery' (do i need to dl anything extra for this?)
then im done, correct? if i boot up, ill get all the stock rom and apps and bloatware and etc back right?
thanks!
edit: how do i know which version of clockwork mod i have installed? im not sure if i did the external sd support or not...

You've gone back to a stock ROM, you've gone back to the stock recovery, but you haven't actually unrooted.
Whichever method you used to root, you should be able to use that same method to unroot.
UPDATE:
I was originally under the assumption that your 2.3.3. ROM was rooted. If it is stock you should be fine.

sorry for bump, but i read in tga_gunmans post that ppl should flash a rooted 2.3.3 rom and use superoneclick to unroot...would my method work too?

No your way would not work because the stock OTA by xboarder is rooted. Do what tga_gunman said. Flash the rom, use my unroot zip in CWM (deletes root files) and then flash the stock recovery. Busybox will still be on the phone but nobody should be looking for that.
Unroot zip: http://www.mediafire.com/?2vr7cmgg7qcdn14

Easiest way to confirm if your not rooted would be to install Superuser from the market. It'll tell you if the phone's not rooted.

There is an app on the market called Root Checker which is free. It will tell you if you are rooted or not.

A little extra help for me?
jboxer said:
No your way would not work because the stock OTA by xboarder is rooted. Do what tga_gunman said. Flash the rom, use my unroot zip in CWM (deletes root files) and then flash the stock recovery. Busybox will still be on the phone but nobody should be looking for that.
Unroot zip:
Click to expand...
Click to collapse
Thanks for your help jboxer. Forgive my noob-like understanding of rooting/unrooting terminology. Hopefully you'll be able to understand what I did.
Last night I went ahead with the unrooting process on my G2X which was running Gingerbread & CM7 following this youtube video (can't post link due to noobiness: watch?v=ryGIv8KQVIE), the order that this guy goes in is:
1. Wiping all cache/user data/formatting in CWM recovery
2. Restore to a barebones stock data in CWM recovery
3. Flash to go back to Stock using OneClickRecovery
4. SuperOneClick to unroot phone
What I ended up doing was restoring my phone to the backup that I created on my sd card when first rooting my phone rather than download that zip file in the video description which is a completely fresh start.
However, whenever I flashed to go back to stock using OneClickRecovery, it gave me that total barebones fresh start where I had to completely set up my Android from the first start screen and I lost my backup. Also, when I go to unroot the phone with that zip file, I don't know how to 'install from zip' after I've lost CWM Recovery menu. So, I flashed back to CWM so I could recover my backup from my SD Card again and install the 'unroot.zip' that you linked and it ran alright and I restarted, but I still had 'SuperUser' in my App drawer telling me that I was still rooted.
I ended up calling it good last night after spending two hours on it. I left my phone rooted, with CWM recovery still on my phone, but I at least I had my backup Gingerbread image with no CM7 mod. So, my phone is functional, but I would like to complete this process of unrooting completely.
Could you perhaps give a little guidance and clarity to what I'm missing or not understanding? I'd love to unroot/flash back to stock recovery/remove all evidence of rooting AND keep my recovered backup that I have before I even started rooting my phone.
Thank you so much for all your help, everybody.

[Q] Restore backup to get ICS OTA Update?

Before I go wiping my device again in anticipation of getting the OTA ICS update...
I made a backup of my device when I was on the original Honeycomb build after rooting. I then switched to the Prime ROM. I'm assuming that I can just restore my Honeycomb update, get Root Keeper and install the OTA update. Am I correct, or is there something that will stop me from doing this?
Edit: Also, when restoring a backup using CWM, does it automatically wipe the device before restoring, or does that need to be done manually?

I believe you also need to restore the original recovery. The last time I tried to flash an upgrade on my rooted stock image using CWM, it rebooted after downloading and rejected the (non-stock) recovery. I'm guessing the ICS update will require a reboot into the stock recovery as well.

Spookymonster said:
I believe you also need to restore the original recovery. The last time I tried to flash an upgrade on my rooted stock image using CWM, it rebooted after downloading and rejected the (non-stock) recovery. I'm guessing the ICS update will require a reboot into the stock recovery as well.
Click to expand...
Click to collapse
Indeed, no OTA update when original recovery is not installed.

I looked around a bit and saw how to unroot and restore to stock recovery... is there an easy way to just restore stock recovery? My plan was to restore my stock backup (to get off revolver) and then can go from CWM -> Stock, I just wasn't sure how to do the last part without undoing everything and fully returning to stock/no root.

It's also very possible that Root Keeper will not work since this is a new firmware form the ground up.

chadcspencer said:
It's also very possible that Root Keeper will not work since this is a new firmware form the ground up.
Click to expand...
Click to collapse
OTA Rootkeeper do not work if the system partition is formatted. Which is not the until now. Also people reported OTA rootkeeper worked to get root back after ICS update.
Otherwise use vipermod option 1 to root on ICS.

darkstar107 said:
Before I go wiping my device again in anticipation of getting the OTA ICS update...
I made a backup of my device when I was on the original Honeycomb build after rooting. I then switched to the Prime ROM. I'm assuming that I can just restore my Honeycomb update, get Root Keeper and install the OTA update. Am I correct, or is there something that will stop me from doing this?
Edit: Also, when restoring a backup using CWM, does it automatically wipe the device before restoring, or does that need to be done manually?
Click to expand...
Click to collapse
I just did exactly this. I had a nandroid backup of my original stock honeycomb so I restored the backup (I had some problems with the kernel after restoring from Revolver with some OC kernel, but flashing "plain" Revolver and then restoring the stock rom from the backup did the trick).
After that I made sure that everything is OK - I checked that I'm on the correct pieces of the software, in particular the kernel. All looked fine so I pulled OTA update, but before applying it I had to restore stock recovery. For this I used the stock recovery linked in this thread: http://forum.xda-developers.com/showthread.php?t=1154947 Just downloaded it, placed it on my SD card, rebooted into CWM recovery and flashed it (pleas note - I only downloaded this single file, not needed to download any other files mentioned n the above thread since I already been on rooted stock rom).
After booting the TF again, I made sure that my root is backed up with Supercurio's Root Keeper, then I applied the OTA and after a few minutes I was happy user of ICSed Transformer.
Please note that what worked in my case may not work in yours though. So be careful, think twice, and keep in mind that it's your decision - your risk (and if something goes wrong - your brick )
BTW, all applications, data, etc. are still in place. Root was restored via Root Keeper. Then I downloaded some updates of applications and so far I'm fine.

Took 4.4.3 OTA with custom recovery >.<

Hello experts,
As the title states I ignorantly took the OTA 4.4.3 with TWRP installed. After downloading the phone asked if I wanted to install the new firmware. I clicked yes and my phone went right into recovery. I tried to nan droid back to Venom 1.8 and It just stuck on the splash screen. I tried multiple venom rom nan droids and none would boot.
I was able to nan droid back to my stock back up (not stock recovery but everything else). I flashed the stock recovery through adb/fastboot and am now trying the OTA again. I assume the OTA should work now ( unless I am missing something ?).
Once the OTA takes, assuming it does, should I be able to restore back to venom ? What was preventing the restore from working originally?
Thank you so much for any help you can offer.
-Tony

Trantzz said:
Hello experts,
As the title states I ignorantly took the OTA 4.4.3 with TWRP installed. After downloading the phone asked if I wanted to install the new firmware. I clicked yes and my phone went right into recovery. I tried to nan droid back to Venom 1.8 and It just stuck on the splash screen. I tried multiple venom rom nan droids and none would boot.
I was able to nan droid back to my stock back up (not stock recovery but everything else). I flashed the stock recovery through adb/fastboot and am now trying the OTA again. I assume the OTA should work now ( unless I am missing something ?).
Once the OTA takes, assuming it does, should I be able to restore back to venom ? What was preventing the restore from working originally?
Thank you so much for any help you can offer.
-Tony
Click to expand...
Click to collapse
Twrp recovery doesn't flash firmware. If all you want is the updated firmware, go to tigerstown's thread and flash the firmware only zip and stay on venom the whole time.

College assisten
dottat said:
Twrp recovery doesn't flash firmware. If all you want is the updated firmware, go to tigerstown's thread and flash the firmware only zip and stay on venom the whole time.
Click to expand...
Click to collapse
Yes, going forward I will install the firmware via fast boot . Since I had a stock backup ( so I thought) I wanted to try it this way.
Everything is working as intended now. Once I flashed the stock recovery the phone updated and I was able to restore Venom 1.8.
Thanks for your input.
-T