Back to Stock,
Here's what I did to get back to stock.
You must choose the files under the GTAB GT7510 /retail/google edition
First you have to install Clock Work Recovery using this link:
http://xdaforums.com/showthread.php?t=1171089
Download the files under FilesForDummies 2 mirrors are listed. These files will help you flash Clockworkrecovery and also the retail recovery is included.
This step needs to be flashed through Odin. You also need to root your device after the flash if your not already rooted. You need the Clock Work Recovery to enter recovery mode so you can flash the Stock Files that I'll point you later.
Once you've flashed the Clockwork recovery you should reboot normally. At this point try to root your device if its not already rooted. Look for OneClickRoot I'll point to that later if you don't already have it.
Not too sure if you need to be rooted as I've always rooted my device before installing roms anyways, but you can try the next steps if your not rooted. If the next steps don't work then reboot and root the device.
Start with your tablet off.
1. Push Powerbutton as soon as you see it startup put your finger on the volume down button and press until you see the android. One side is a box saying recovery the other download. Choose download mode by pushing volume down to choose and up to enter you will be prompted at this time just take if from there. Make sure Odin is up and running, choose the PDA file as Clockwork cm4.04 its that file in the zip you just downloaded and extracted.
2. Flash Clockwork file Clockwork CM4.04 etc... using ODIN should be included in the zipped file you've downloaded. Make sure these files are unzipped in the same folder. Now after flashing the tablet should reboot and it would look normally like it did before except you have clockworkrecovery instead of the stock one.
3. Go back to the link I sent you above and scrool down until you see flashing roms and kernals heading. Click on Stock US Retail Rom, this will download the Stock US Retail 3.1 file for Clockwork. choose : hc-3.1_ota-full_sam file, and then also click on the recovery hc3.1 file.
Put these files in the same folder or somewhere where you can find them. Not sure if these are already in the file you downloaded above, if they are then don't have to download these.
4. Unzip the files and make sure you remember where they are.
5. With your tablet on and plug into your usb port transfer the hc-3.1 ota file you've just downloaded and put it into the root directory of your tablet. It should not be in any folders just in the /SD folder.
5. Now turn off the tablet, once off push power button again and enter recovery this time choosing the left android with the box. Push left button to choose and right volume button to enter. Now you should be in clockwork recover orange writing. Now look for update from Sd card, use volume button left to choose and right to enter. Click then you should see the file you've copied on your sd card of your tablet. Click down and then use left volume button to choose.
6. Once there it should start flashing the Stock Rom, once done it will return you to where you started, at this point you can choose to wipe data/ cache etc. You can do that to make sure you've clear everything in your tablet before you actually reboot. Once done choose reboot and your tablet should be back to stock but not just yet.
7. You could leave Clockwork on there or you can go directly back to stock by doing the same steps from 1 and 2 and flash the STock Recovery instead. This will bring the tablet right back to HC3.1 and Retail Stock. From this point on you can flash up to 3.2 etc.
Hope this helps but I can't go into it in any length as I'm hoping you know most of the terminolgy.
There is also videos on this link to help you.
