I just joined this group and have a XT926 Razr Maxx HD
I believe it was at 4.4.2 as I have a screen shot dated 3/3/15 and was stock, not rooted.
It is stuck at the android robot logo. That happened after it froze while unattendend. A restart resulted in this situation.
I have gotten into the bios and cleared cache to no avail. And then erased everything, still to no avail.
What are the steps to restore it to 4.4.2 or better. At this point, out of warranty and contract, I am OK with rooting as well. But I would like to get it running ASAP as this is my main internet access by hotspot.