Been a lurker here for some time. I recently purchased a One X from ebay in the UK, On receiving it I realised that it has a custom nexus styled jellybean ROM and won't pick up a signal with any sim card I use. Also I live in Ireland if that makes any difference. Unfortunately returning the phone isn't an option. I don't know if it had an EU rom or network branded one previously. I had a situation once like this in the past where I just ran the stock RUU on my old HTC sensation and it worked like a charm. Just not sure how to approach this one.
EDIT: The seller just mailed me to say that its originally T-Mobile network.
Here's all the info I know of that may be helpful.
Its obviously rooted
From the bootloader:
endeavoru pvt ship s-on rl
HW Secure boot: enabled
Modem path: off
Also it has Custom recovery - CMW based v188.8.131.52
Android Version 4.2.2
Baseband Version 5.1204.155.29
Kernal Version 3.1.10-g3d29e5d adrian@fuzzy #2013082515 Sun Aug 25 14:13:56 CEST 2013
Build no: tg_endeavoru-userdebug 4.2.2 JDQ39 eng.adrian.20130825.141556 test keys
Any help would be greatly appreciated.