I have the same problem. I used firewater to unlock and s-off my HTC One with 4.3. Everything went well and I installrd TWRP. I did a back up and when I restarted the phone it said No OS. After trying so many things I ended up, only able to boot into bootloader with no recovery or os and anything I try to send to the phone fails.
C:\platform-tools>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.55.0000
(bootloader) version-baseband: N/A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: XA SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid:
(bootloader) product: m7_wlv
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN073****
(bootloader) cidnum: VZW__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4256mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-3c88cdd7
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.110s
Thanks for any in put guys.