[One (M7) Q&A, Help & Troubleshooting] bennnd:
Hi everybody,

Apologies for clearly singing up just to ask for help. But as this is where I lurked to get the majority of the information I've used, it seemed like a good place to start asking questions, too.

I've made quite a mess of my phone, and I'm unsure of even where to start looking for existing guides and help docs. Not that I haven't tried! But there is such a wealth of information out there that Google searches yield too many results to be able to differentiate between.

Anyway, the phone's condition, as it were:

I was following a guide to convert my HTC One (Optus, Australia) to a GPE. Everything was going relatively smoothly. I'd previously flashed TWRP, rooted, flashed a stock 4.4 (not available on Optus, yet), flashed Bulletproof kernel, S-OFF'd, changed my CID to GOOGL001 and was changing my MID to PN0712000 in order to (I hoped) complete the conversion. While the guide said that this was no longer necessary, I was getting an error, so figured I'd follow it the way it was written initially.

I changed the MID, no worries. fastboot getvar all showed the updated values. But I still had no luck flashing the GPE rom. I decided to give up, because I really didn't have a problem with how it was at the time.

Then I got a notification saying an update was available. Without paying too much attention, I downloaded it, and then (obviously, in retrospect) got thrown the error that my software had been tampered with, and that I could not install the update. So I implemented plan "Change Everything Back To How It Was", and began moving backwards, chronologically.

I changed back my MID, and then ... nothing. The phone looks, to all intents and purposes, dead.

I cried for a few hours, then tried to sort it out. The phone is not dead, but at the moment this is all I can do:

- The screen will not turn on. At all. Nada.

- The phone can be accessed via fastboot from the PC.

- The phone does not like rebooting in fastboot via the PC.

- Occasionally the orange LED will turn on, but this is intermittent.

- Power cycling with buttons works sometimes. As in, sometimes if I hold the power button, it will reset. Other times it appears to do nothing. Also, sometimes (the phone must clearly be on somehow) the Back and Home buttons flash, like a regular reboot. But, again, all of this is intermittent, and I can never make the same thing happen twice in a row.

I can't think of any more details about the phone's current state to provide, but would be more than happy to check for any information and report back!

Current getvar results, if they provide any kind of help:

INFOversion: 0.5

INFOversion-bootloader: 1.39.2000

INFOversion-baseband: N/A

INFOversion-cpld: None

INFOversion-microp: None

INFOversion-main: 4.06.1540.2

INFOversion-misc: PVT ENG S-OFF

INFOserialno: <removed>

INFOimei: <removed>

INFOmeid: 00000000000000

INFOproduct: m7_ul

INFOplatform: HBOOT-8064

INFOmodelid: PN0714000

INFOcidnum: OPTUS001

INFObattery-status: good

INFObattery-voltage: 4003mV

INFOpartition-layout: Generic

INFOsecurity: off

INFObuild-mode: ENG

INFOboot-mode: FASTBOOT

INFOcommitno-bootloader: 080b6f61

INFOhbootpreupdate: 11

INFOgencheckpt: 0

Any help would be hugely appreciated! I don't know if I've killed it beyond personal repair, but I'm willing to try any ideas! I've booted up my old iPhone, so it's not hugely pressing, but this experience is just driving home my dislike of this tiny phone... I'd quite like to get my One up and running again!

Thanks to any and all in advance!