Where are you downloading your ROMs? You mentioned earlier that you flashed cm10.4 but there is no such ROM for this device. You need to be careful about where you get your ROMs, flashing a ROM that isn't intended for this device can easily result in a brick.
Your ROM flashes were failing because your firmware is too old, it does state pretty clearly in the install instructions on the cm threads that you need to update your firmware via the 3.18 RUU. So you need to download the 3.18 RUU
and run that which will update your firmware. Here's a very useful thread
which details how to run an RUU.
After you've done that you'll need to flash TWRP again. If you want to flash the latest cm, which is cm11, you need to install the modified version of TWRP 126.96.36.199 recovery which can be found in our Original Android Development section. Download the modified version of TWRP 188.8.131.52 from here
. Put the file in your fastboot folder. Connect phone in fastboot mode, open command prompt from within fastboot folder, issue the following commands:
fastboot flash recovery "filename.img"
(the exact filename, minus the talking marks)
fastboot erase cache
Now you can enter TWRP and flash your ROM + gapps. Because you're new here I'd suggest you click the Everything Evita link in my signature and bookmark it, it contains links to basically everything for our phone. You should also click the other links in my signature and read those threads, you'll find them very helpful. Here's a few important links for you too:
One XL Main Page
One XL Q&A
One XL Android Development
One XL Original Android Development
Make sure you only ever download ROMs from the development sections I've linked there, many people make the mistake of wandering into the HTC One X forum and flashing those ROMs, many of those people bricked their phone. That might seem confusing but you don't have the HTC One X (Endeavoru), you have the HTC One XL / at&t One X (Evita). If you have any further questions just ask either here or in my q&a thread (link in my signature).
Sent from my Evita