XT1053 20 sec reboot loop

XT1053 yesterday got into a never-ending reboot loop on around 20th second of loading up. I think the phone had the latest firmware update on it.

I tried to upload a new firmware:

GHOST_RETAIL_5.1_LPA23.12-15_cid9_CFC
RETAIL-US_4.4.4_KXA21.12-L1.29.1_2_cid9_CFC_1FF
TMO_5.1_LPA23.12-15_15

Using RSDLite 6.1.5

I always get:

downgraded security version
update gpt_main version failed
preflash validation failed for GPT

Any ideas how to proceed?

P.S. XT1053 is a US *unlocked* version purchased directly from Motorola.

[XT1053] Updated Boot Animation causing Boot Loop

Hey guys,

I was using my phone today and decided to turn it off. I am currently on 5.1 and I am rooted on stock. When I turned it back on, I was kind of stuck on a boot loop but I can usually bypass this by holding down the power button until I feel a quick vibrate and then my phone starts doing the "Optimizing Apps...". However, it didn't do that this time so I decided to reboot my phone into recovery, wipe the cache and dalvik and restart. Again, stuck on the boot animation screen. So I just let it run its course and then all of a sudden I see my phone go to the home screen but my launcher is reset and I am running out of cache space. I decide to connect my phone to my computer and backup some files. As I backup the last of my DCIM folder, my phone reboots and all of a sudden I have the new Motorola boot animation with the stitching I guess. But then I'm stuck at the bootloop again.

Anyone else experience this or know how I can fix this? I reaaallly don't want to factory reset.