ASUS has pushed out an update to the ASUS Transformer Pad TF300 which brought Android 4.2.2 to the slate. But if you happened to have your bootloader unlocked and missed the update, or want to try to install an update directly from ASUS’ servers, the OEM has released a ROM of Android 4.2.1 for the slate.
It comes in three flavors, Global, China or P2P, so better ascertain which group you’re in before starting. All three are about 500MB in size.
All of the new features, enhancements and bug fixes are here. All of the Android 4.2 features are represented like multi-users, quick setting and lock-screen widgets