If your tablet has 4.2.1 Android version from Asus, DO NOT FLASH A RECOVERY THAT WAS ACTUALLY MADE FOR 4.1 TABLETS! You will end up on a PERMANENT BRICK with no solution until now. You won't be able to use fastboot ever again. You won't be able to flash anything ever again. You will be stuck with a bricked tablet!
Older ROMs won't work with the new bootloader, such as CM10.1 and ParanoidAndroid ! READ THE ROM THREAD AND ENSURE IT SAYS IT WORKS ON A 4.2 BOOTLOADER! If you are unsure, then READ THE THREAD ANSWERS, ASK AND SEARCH! Five minutes of search can save you from ruin your tablet.
OLDER KERNELS WON'T WORK ON THE NEW BOOTLOADER!! Don't even try to flash TF700T ones!!
If you are looking for a Recovery for a 4.2.1 bootloader (and a complete guide for updating), read this thread: http://forum.xda-developers.com/show....php?t=2187982 Don't do it with any other tutorial: they are for 4.1 bootloaders!
STAY AWAY FROM CWM FOR NOW!
If you don't want to download TWRP from the post above and want to do it from the official TWRP website ensure that you use the correct version for your bootloader! Any other one will brick your tablet! Read the list below:[LIST][*]If you are on Ice Cream Sandwich (Android 4.0.3): download openrecovery-twrp-2.#.#.#-tf300t(g)-ICS.blob[*]If you are on Jelly Bean (Android 4.1.1): download openrecovery-twrp-2.#.#.#-tf300t(g)-JB.blob[*]If you are on Jelly Bean (Android 4.2.1): download openrecovery-twrp-2.#.#.#-tf300t(g)-4.2.blob
Here you have a list of ROMs that are compatible with the new bootloader and are safe to flash once you are on 4.2.1 firmware:
- CleanROM Inheritance Xenogenesis from sbdags
- Energy™ from NRGZ28
- GRIMLOCK from hardslog
- CyanogenMod 10.1 Unofficial from pcoussa
- ROM-THEME- STOCK KERNEL Stock Asus Firmware 10.6.1.15.3 from surdu_petru
I hope I was clear enough :P