first if you download the updates from Motorola they won't work right now they are bad and you have to use the links to dowload them from here (the link)
you don't need safestrap it will cause all kinds of problems , you only need it if you want to do special roms
this link was a lot of work by sigvor thanks to him for typing all this out
you have to go back to 4.04 to root then use Voodo to save the root, then unroot saving root, then update
after updating each time (two updates) go back and root and reload binaries in SU
then unroot and update , after your all the way back to Jelly Bean use Voodo to re-enable Root
do a hard reset after your back to Jelly bean and you may loose Voodo in this process , if so reload it from the store and I am usually able to reroot with it, even though it disappeared during hard reset.
here is the link follow it and you should be good, it's a bit of a process and again thanks to Matt for the way to do it
and thanks to Sigvor for doing this link for a step by step, and again this is for the MAXX HD just to be sure, that is the forum your in .
also if you get stuck along the way I have had to reload the USB drivers even though I had already done this. ( windows 7)
Root XT926 to 4.1.1 Jelly Bean When OTAs Are Not Working - DroidRzr.com