If you want to keep it completely stock, no root, the easiest (or, maybe the only) way is to download stock 4.2.2 ROM and flash with Odin. You can check sammobile or samsung-updates, but getting the file might be a hassle after all that recent mess with changing file hosting from hotfile...
Optimus G F180S, tweaked E975 Stock 4.1.2
MeMO Pad HD 7 ME173X, rooted stock 4.2.2
To whom it may concern: STOP nagging about pressing the freakin' Thanks button!!! It is rude, stupid, and annoys the hell out of people. I am not an idiot who needs a huge in-my-face reminder to press it, and I will press it when I feel thankful, not because you asked for it!