Do you tried to flash Asus stock rom v.13.10.10.34(1.4gb) from Asus stock recovery v.13.10.10 34. I don't mean flash from TWRP.
Well, i can feel some doubt in your post...but h*ll yeah! I'm currently facing the same problem; where flashing stock rom, downloaded from their site, using their stock recovery, adb, and adb sideload....
the rom flashes successfully, but still boots with the same error...To be frank, i'm fed up...and almost about giving up on this phone...
-i believe i'll give it another shot this very night, trying different methods...funny ones though; if and when they work, i will definitely update my post again... my phone version is Z00ED, in case anybody cares to know

-
UPDATE:
=======
Aaaaaanyway, I downloaded 2 kinds of stock roms from the Asus official site;
1. UL-ASUS_Z00E-WW-13.1010.1612.53-user (the latest:- M) and...
2. UL-ASUS_Z00E-WW-12.8.5.222-user (and older version:- actually, the pre-installed version)
after flashing the first one over and over again; after and before wiping my phone and cache over and over again, NOTHING HAPPENED; no change!!! still kept throwing back the error message.
So I decided to flash the second one, and for a split second, I was happy cos the error had disappear...only for me to wait for eternity and in vain for the phone to boot (that is, even if it could). suddenly, I realized what had happen....the phone couldn't boot pass the ASUS logo, neither could it load recovery again (as it used to). It only boots into ADB, but of course, that will require USB DEBUG MODE to be ON to be able for the phone to be detected through ADB (which is far from possible due to the numerous wipes I performed).
CURRENT SITUATION: I can't ADB, I can't get into recovery, and I'm stacked with the logo at boot......when the phone is completely turned off and placed on charge, the battery shows an empty battery with the loading (status) sign (but it charges, even without the OS being able to display the process).
Don't know whether anyone is facing same, or I can start a new thread with this? and I need help before taking it to a 3rd party repairs (since we don't hv Asus customer care in our country yet).
Will be glad to find help.
PS: The computer still detects the phone as an ADB Android device, and to me, that's a beacon of hope.