Ok, I'm having some trouble finding the UK/3 latest stock rom.
Please allow me to suggest the ViperOneM8 rom - it's exactly what you had before PLUS:
- already rooted
- has some excellent extra features that you can choose to customize your Sense experience even more
- or - just leave it as-is and you won't know the difference
This will get you out of your useless state and at least running.
If you don't like it, no problem, there won't be a panic to find the unblemished latest stock, and you'll have a working phone while you search.
Go here -
http://venomroms.com/htc-one-m8/
Choose to download - Latest Fullrom: ViperOneM8 4.3.0
After download, move or copy it to your sdk-tools folder.
Now, lets ensure that you did not get a dodgy download.
In your command window, say -
md5sums ViperOneM8_4.3.0.zip
(Ok to use the copy/paste trick on that.)
Compare the output value to this one: b53b6318c11ca844bfcbf4fc9be6d064
(Upper or lower case letters do not matter.)
If the same, the download was good. If not, download again, check it again.
When happy, make sure that phone is still slid into adb sideload in the Advanced area, and in command window say -
adb sideload ViperOneM8_4.3.0.zip
Ok to copy/paste that. And hit enter of course.
Wait.
Eventually, an installation wizard will appear on your phone.
Follow the prompts, you'll be choosing the defaults for most things, and choose to install the rom.
Don't worry about any fancy options - your carrier, or GSM, and the rom.
Do not be concerned if it takes a while. That's ok.
Report back if any issues.
If no issues, attempt to boot system.
If boot is successful, you'll eventually see a dialog telling you that it is updating or installing apps.
That will take a while. That's ok.
If the installation in TWRP said it was a success but it does not boot -
Do not panic.
Because your phone is unlocked but still has s-on HTC protection, that can happen from time to time.
It is easy to fix.
Let's try this first ok.