Ok, I've been up and down this thread and others making sure to read and re-read everything before applying the update, but the update failed for me. I tried via the OTA system prompt twice and once via stock recovery. Details below:
XT926 - Droid Razr HD Maxx. Current system version is 9.16.6 and new version is 9.18.79. I am rooted and bootloader is unlocked (just decided to do that yesterday). I had installed TWRP via Razr HD Recovery Flasher V6 (and manually typed the commands from the .bat file because I'm on a Mac), but I saw that stock recovery was required so I put that back on via the same tool. I also did temp unroot via Voodoo OTA Rootkeeper before applying the update. Both times I tried via the system prompt it failed within 30 seconds (saw "dead" Android for a few seconds and then it reboots). I manually applied the update through recovery (via ADB since I don't have an external SD card) and the error is below:
assert failed: apply_patch_check("/modem/image/dsps.b01", "62d778c9c131d326314a621c07c83f773d0ae90e", "bf66bb5baa2113e35c766e77015f902b2fce9e1c")
Now, my guess is that this has something to do with my baseband being a different version (ends in .05 instead .09 like everyone else). I wonder if the last update failed a baseband update but the OS update succeeded and I didn't notice. Thoughts?
Try this if you would Download the OTA from Settings> About phone> System updates. Do not install, yet. Go to your Mac and first make sure you have the latest version of Device Manager or get it from here. Next, plug in your device and allow Device Manager to connect with it (this may or may not work) go into your Settings> About phone> System updates and select the Install update while plugged in with Device Manager running. Since, your Bootloader is unlocked do not worry about backing up via RootKeeper OTA as if this installation works it will destroy Root anyhow. I have a method here, that you can use to regain Root after the OTA works.
In the event that the OTA does go through and the new Radio does not install, click here. GL!
Edit: I'm going to go plug it into the AC, see if I can get an "acceptable" battery charge
Now of to root I guess...
I would highly recommend spending a few bills and purchasing an SD card strictly to back up important files, afterall this device is not done with OTA's. And if those of us that have an Unlocked Bootloader if we can install the OTA's error free from Device Manager, than that will save a great deal of time and aggravation.
It took me 2 months to grow a set, but this worked like a champ.
I was rooted and unlocked (everything else stock).
Backed up root with OTA Rootkeeper
Connected phone to laptop as above
Restored root with OTA Rootkeeper