Default [Q] Update device with no SIM?

So I switched devices a few months ago to an LG G2. I'm going to start using my old AT&T One X as an iPod Touch like device. I went to download the update and it says "Network is not ready" since I don't have a SIM in it. I went to HTC's site to download and install it manually. Well it turns out you can't do that. They don't have a download link for it and customer support told me tough luck. Is there a download of the updates on the web somewhere that I keep missing or am I out of luck and should root/ROM? I'm fine rooting the phone and putting CM on it. I just wanted to check out the new software that everyone waited far too long for.