O2 UK HTC One M8. No OS. Please help me :'(

Hi all,

So a few months ago I flashed a custom GPE Rom onto my M8. It was successful until I tried to remove TWRP and accidentally deleted my OS instead.
I tried to fix the problem but I just couldn't get it to work. I figured I would have another crack at it with the help of the XDA forums.

Currently I have S-Off, TWRP installed and kinda got fastboot working (sometimes it derps and won't recognize in the command prompt).

(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.23.213311491.A13G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: (Deleted for obvious reasons)
(bootloader) imei: (Deleted for obvious reasons)
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 11459804
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.066s

I have tried numerous things to get back to stock O2 UK but nothing is working.

Could someone please help me and walk me through how to get back to normal ?

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