How to take off CyanogenMod out of my Android 4.2.1?

Title says everything.

Some quick briefing about what happened. I did flashed my S3 and managed to get cyanogenmod (custom rom 4.3.1) and the cellphone has been so damn buggy and I hate it so much that I would like to get it back to default android.

After some research on forums such as androidzone,x-da developers and so many other forums.

All I ask, is for a guide which I can restore my phone to factory settings.
:laugh:
Thanks alot guys!

 

Any help folks? I posted once more on xda-developers seems they're taking their time to help me.

 

Any help mates really need it.

 

if you want my honest opinion, forget about CM 4.3.1, You should down load the custom rom 4.4.2 I skipped 4.3.x for the reason that shit is buggy as hell. The 4.4 kit kat rom is really well integrated and honestly its probably the best rom i have ever used. The link below takes you to the official 4.4 thread on xda.

http://forum.xda-developers.com/showthread.php?t=2529775

That rom is amazing BUT if you are not willing to try it the link below will show you how to get back to your original rom.

http://forum.xda-developers.com/showthread.php?t=2323847

 

You should have created a backup of your stock ROM before flashing. Novice mistake.

 

But you can revert it back downloading it from XDA.

 

Thanks to all that posted above. I have fully recovered my stock ROM and finally my phone is back to normal and without those stupid bugs that almost made me buy a new shitty phone.