Default [Q] Any stock ruu Available to get me out of this mess??

Im stuck softbricked NO O.S INSTALLED on 4.4.2 ota stock.. from what i gather htc has little to No Ruu available, unlesss anyone knows of or has the 4.4.2 latest 3.10.502.3 version
I am screwed it seems, I can sideload to twrp from my pc but soon as it hits 100% and tries to install twrp says Unable to mount system!!
theres no way out.
Any help ? its real evident that my partitions are way way messed up Even formatting them in twrp doesnt help .
All i have is hboot that functions fine but twrp is useless.
I could use a good idea ? Can i ruu downgrade or use any ruu