[Galaxy Tab 2 Q&A, Help & Troubleshooting] CyanogenModFTW:
You can't really restore them, because they're on a different ROM, it'd overwrite all your fresh and fast ROM.

In two words: you can't.

You will need a country specific firmware, where did you buy your P5100; was it from.. anywhere in the world? Check for a sim card slot.

If it doesn't, get on to reading!

1. Find how much bits your windows is.... this can be done by opening the start orb in the bottom left corner, then right-click on computer. Click Properties, and look for 64 or 32.

Pick 64 if you have 64, or pick 32 if you have 32.

2. Install drivers according to your bits.

These will ensure good experience.

- 64bit: http://drivers.softpedia.com/get/MOB...dows-x64.shtml

- 32bit: http://drivers.softpedia.com/get/MOB...dows-x86.shtml

3. Download UK recovery! That is, if you don't have a SIM card slot.

Find here: http://www.sammobile.com/firmwares/3/?download=22456

Now, I was quite lazy to write a tutorial, so I did copy some sources. they will all be given credit.

1. Download and Install the Samsung USB drivers to your PC from the link above. Reboot your system once after installation. If you have already have KIES installed you can skip this step

Extract the Odin Package you downloaded earlier to your desktop. Look for the Odin exe file. That's the only one we would be using

Extract the downloaded stock firmware zip file to your desktop

On your Tab, go to Settings > Developer Options and Enable USB Debugging

Now Power off your Tab completely. We will now be putting your device into Download mode or Odin Mode as it is also called. Download mode is basically a Samsung Exclusive mode which allows flashing of firmware via Odin. Odin can only communicate with Samsung devices when they are in Download Mode. To get there, press and hold these keys together: Volume Down + Power. Then press Volume Up to enter download mode

On your PC, launch Odin by double clicking the exe file in the Odin folder. Just make sure that Samsung KIES is not running on your PC at this time. KIES and Odin don't like each other very much.

Connect your Tab 2 to PC using the OEM USB cable. Any microUSB cable should work, but I prefer to use the one supplied with the phone to avoid any unforeseen complications. You should see the message Added!! in the main Odin message box like in the screenshot below, as well as as COM Port number in the first slot directly above the message box, which tells you that Odin has recognized your device

odin_zpsc9caf496.jpg

In Odin, click the PDA button, locate the stock firmware .tar file that you extracted in Step 3. If there are additional file for the modem and CSC, add those as well. Make sure the Auto Reboot and the Reset Time boxes are checked and Re-partition box is NOT checked.

Double check everything in Step 8, then hit the Start button to restore your Tab 2 to stock Samsung firmware

Once Odin has finished flashing the CWM recovery, your Tab should automatically reboot. And if the flashing was successful, you should see the word PASS! against a green background at the top-left in the Odin window. This means it is now safe to disconnect your device. (SOURCE: http://androidevolved.com/forums/ga...tore-stock-firmware-gt-p5100-p5110-p5113.html)