ZE551ML - Stuck in fastboot mode, unable to write using Asus Flash Tool or xFSTK

C:\Asus_Zen_Phone_2>fastboot3 oem partition /tmp/partition.tbl
...
FAILED (remote: GPT command failed) - Also found in Asus flash tool

[2016-07-14T 01:53:53Z] (0x00000000) [0123456789ABCDEF] Flash image ...
[2016-07-14T 01:54:32Z] (0x00000000) [0123456789ABCDEF] Flash image failure(FAILED (remote: GPT command failed)

I tried to flash boot, recovery, droidboot, and system.img, but no luck. Anytime I reboot, goes to fastboot mode only.

Trying to use xFSTK Downloader v1.7, I do not get USB logo. Phone boots into fastboot mode only.

HELP!