How can I return my Sprint HTC One M8 Harman Kardon to stock so I can take the Lollipop OTA?

[AC Question]

Background-

Rooted using HTCDev.
TWRP was installed.
Phone was rooted.
Bootloader was unlocked.
Phone was S-ON.

After numerous failed attempts, the phone still won't take the OTA.

Now the phone is
S-ON
Rooted.
Stock recovery.
Relocked bootloader.

All I want is to take the OTA or flash a stock Lollipop ROM. How can I do this?

KK 4.4.4
fastboot getvar all returns this

(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.08.20.0916
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.31.654.2
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) cidnum: SPCS_004
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

 

[Rukbat]

Flash the stock 4.4.4 ROM (after backing everything up). Update. Reinstall everything.