Hi there, I have droid bionic that i have flash the leak .893 last month and rooted, I just recently unroot and flash back to stock with Windows_One-click_Fastboot_Restore_and_Root to receive ota update, However i can complete download the update but it fail when installing it.
So this is what i did:Manually did the recovery by hold power and both volume button and wipe data factory rest and wipe cash, then reboot my bionic.
Then use the:Windows_One-click_Fastboot_Restore_and_Root again. after done the phone reboot and don't log in to google account just skip everything,
Try download the update and follow the on screen. It work for me, I am now on 5.5.893 OTA, the installation complete successfully.
Hope this help!!