1. Download a 4.3 ROM on PC
2. Go into twrp, wipe cache, dalvik, data, and system.
3. Place a ROM on your computer in the same folder as your adb tools
4. In twrp, go to advanced, then side load
5. In command prompt on the PC, issue the command "adb sideload filename.zip" from the folder containing your adb tools and the rom
Sent from my HTCONE using XDA Premium 4 mobile app
If I helped you, don't forget the thanks button!
Phone: Sprint HTC One
ROM: Dark EclipticONE 3.8.2
Bootloader: Revone S-Off
Recovery: TWRP 2.5