[Droid Ultra Q&A, Help & Troubleshooting] TEPEM:
Hello all forum members. this is being also discussed in the Droid Maxx Develkoper Edition thread but I also decided to bring it to a larger audience. Now let me lay out the whole story together for you.

So it was XT1080MDEV phone running 4.2.2

- System Version 12.7.7.obake-maxx_verizon.Verizon.en.US

- Baseband MSM8960PRO_BP_2323.011.75.00R

- Build Number 12.9.0Q2.X-160-OBK_TA-14-7

It was bootloader unlocked but with a stock reovery and unrooted. I operated fastboot so I took to flash custom recovery twrp-2.6.3.1-ghost-4.4.img while in fastboot mode.

It worked out great: it flashed and also offered to install SuperSU after 1st start so I rooted and was playing with phone for a while. The phone was on Wifi without SIM and I never customized system - rather installed few apps and played Asphalt. I turned it off and on few times and even did a full backup with TWRP.

Then I left my phone on and unattended for 15 mins maybe and when I was back I discovered that it shows standard boot message "Warning Unlocked Recovery....etc" but after hanging a bit it does not show droid splashscreen and boot but turns black a shows "Warning Unlocked Recovery....etc" message again.

So primarily I got this bootloop with no possibility to even power off the phone. By holding Power and Volume Down buttons for 10 seconds and releasing them I am able to get into fastboot mode. I tried "Normal Powerup", "Factory", "Recovery" and "BP Tools" - all result in the same bootloop. "Barcodes" shows IMEI etc.

Since bootloader mode was the only option available for me I was trying out flashing different recoveries. Here's the list of what I tried with no luck:

- openrecovery-twrp-2.8.4.0-obake.img

- philz_touch_6.19.3-xt1060.img

- twrp-2.6.3.1-ghost-4.4.img

- stock recovery (stock one taken from VZW-4.2.2-SU1-15-3-release-keys.xml.zip FW)

After all those runabouts with recoveries I caught myself thinking that it all looks like it's not a recovery which is "broken" - but rather a boot.

So I tried flashing boot.img (from VZW-4.2.2-SU1-15-3-release-keys.xml.zip FW) - no results. It is the same bootloop.

This is where I decided to flash the whole stock firmware VZW-4.2.2-SU1-15-3-release-keys.xml.zip with RSDLite 6.1.5. It flashed firmware without any errors as I removed <step var="max-download-size" operation="getvar"> from the xml file as indicated in how-to- guide, but the phone is stuck in the same bootloop.

Now behavior has changed a bit and it seems I can power it off. However I left it in bootloader mode and hooked to USB on a working PC since this is the way it's charing.

- When selecting either "Normal Powerup" or "Factory" it displays

static

"Warning Unlocked Recovery....etc" message.

- When selecting either "Recovery" or "BP Tools" it result in the same bootloop: "Warning Unlocked Recovery....etc" message

appears and disappears in loop.

"Barcodes" still hows IMEI etc.

I can see now that bootloader version has changed from 30.70 (sha-88483d6, 2013-07-02 15:32:03) to 30.B0 (sha-e8687f9, 2013-08-20 21:05:17) but phone still won't boot.

I tried flashing stock 4.2.2 two times with RSD - just to make sure everything is done fine and any occasional factor is excluded but results are the same.

Please help!

P.S. I attach a screenshot of the bootloader - this is the only operable mode I am able to access.