[AT&T, Rogers HTC One X, Telstra One XL] eraste:
Ok this is a simple guide more for newer users as older members here already will know this information probably.

As people may have heard there is a new OTA for ATT. I and gunnyman bit the bullet to see if the old way of doing things ( upgrading, etc as long as you already had unlock token ) still worked with this new base and OTA.

Im proud to say yes. thanks to gunnyman and zounduser for help and hopes that I made it though un harmed lol

Disclaimer As usual this works as I am proof. However I cant be held liable if you mess up your phone! This only works for those who are already unlocked rooted etc.

Here are the steps to getting the update safely.

Prerequisites:

1. You must already be unlocked with supercid and have your Unlock_code.bin file still on your pc. ( there is a thread for this )

2. you must be rooted

3. You must have an understanding of adb and how it works (threads all over xda)

4. Have an RUU available I used 1.85

5. copy of custom recovery twrp 2.1.8.1 is what i used

6. copy of superuser in a zip available in attachments at bottom.

7. Disable HTC SYNC from running!

Here we go:

1. Reboot your phone into fastboot

2. Open a command promp and point to your adb directory. Type the following command: fastboot oem lock

This will lock your bootloader allowing you to RUU

3. Open the 1.85 RUU file.

4. Go through the RUU process.

5. Once you have finished RUUing boot the phone up if it isint booted already

6. Do a minimal setup just skip through the initial set up screens.

7. Check for att software update.

8. A box will appear saying a security update is available. enable your wifi and download it.

9. Allow the update to install

10. After the update finishes ( takes roughly 8-10 mins) some faster some longer. Boot the phone if it isin't booted ( should be ) disable fastboot under system settings power. Enable USB debugging under system developer options.

11. Attach your phone to your pc if it isint already.

12. Open a command promp and point to your adb directory.

type: adb reboot bootloader. If you get an error from adb type adb reboot-bootloader

13. Locate your unlocktoken Unlock_code.bin and place it in the same folder as your adb, fastboot, etc if its not already there from the last time you unlocked.

14. Flash your unlock token. Open a command prompt and type:

fastboot flash unlocktoken Unlock_code.bin

15. Once the token flashes before selecting yes to unlock, unplug your phone from pc. After you unplug it go ahead and select yes.

16. Once phone boots up do a minimal set up as before. Plug your phone back in to pc. Open command prompt and type: to verify unlock

adb reboot bootloader if you get an error from adb type adb reboot-bootloader

you should now see UNLOCKED at the top. If not repeat number 14 until it sticks can take a few tries.

17. If your screen says unlocked, flash your custom recovery. Locate your recovery flash it by typing in command promp: fastboot flash recovery recoveryname.img ( twrp2.1.8.1.img is mine replace with whatever yours is)

18. Once you have the recovery flashed reboot the phone.

19. Plug the phone in and select disk drive. Copy the superuser zip over to your sd card.

20. After that select charge only, open a command prompt and type:

adb reboot recovery

21. Once in recovery locate the superuser zip and flash it.

22. Reboot enjoy you should now be on OTA 2.20 Unlocked, Rooted, etc

O one thing I forgot Please hit thanks if this helped you!

Issues:

1. If you update you will get a newer hboot, you may not be able to use other older ruu's such as 1.85, etc. Recommend immediately making a backup once rooted, unlocked, etc.

2. Updating results in boot.IMG from custom roms not being flashed again. Have to flash the boot.IMG of custom Rom in fastboot as before.

3. Radio.img will not flash on new hboot either must be done in fastboot same as boot.img.