I was playing around with *#*#4636#*#* because my Atrix wouldn't connect to 3g and accidentally set the radio band to USA Band now with no way of changing it back. I'm currently in China for another few months so I can't take it back to the local AT&T and ask for a fix. I've searched for this issue and it appears that there were other people with the problem but all of them were from 3-4 months ago and I'm not sure if they still work, such as Flashing SBF, but it's an unofficial 1.5.2. Here's the link: [GUIDE] Flash SBF to Motorola Atrix 4G - xda-developers In my search I also found something to unlock the Bootloader, but I'm not tech-savvy enough to know if that'll help at all or not. Link: How To: Unlock the Atrix 4G Bootloader - BriefMobile I was wondering if anyone had a better solution now or if flashing to 1.5.2 still works after all this time.