Develop Bugs

Stuck on splash screen- desperately need help!

Hi guys,
I received my AT&T HTC M8 last week.
I wanted to flash the Android Revolution HD rom so I unrooted the device, installed TWRP, super CID it and S-Off it.
I tried to install the Rom but the WIFI didn't work so I rolled back to the Stock using TWRP.
I did some reaches and realize I need to update the Firmware so I did. The messaged at the end of the process was "completed successfully" but when I rebooted the device it got stuck at the splash screen. I can hear the ATT load chime but the AT&T icon is not displayed and that's it, stuck!!!!
I entered the HBoot and tried to access the recovery. The screen gets black with a red triangle icon in the center and the device reboot after several minutes. I think the Hboot message is no image.
When I connect the device to the computer it is recognized and I can access the files etc. but the ADB doesn't see the device any more.
I'm really lost and frustrated after hours and hours of reading and research without any luck.
Any help will be truly appreciated.
This is the device variables before I updated the firmware:
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.16.0.0000
(bootloader) version-baseband: 1.16.21331931.LA11G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: HT453WM01167
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(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: c3d94491
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
I look forward to your advice.
Thanks a lot in advance.

ronf0303 said:
Hi guys,
I received my AT&T HTC M8 last week.
I wanted to flash the Android Revolution HD rom so I unrooted the device, installed TWRP, super CID it and S-Off it.
I tried to install the Rom but the WIFI didn't work so I rolled back to the Stock using TWRP.
I did some reaches and realize I need to update the Firmware so I did. The messaged at the end of the process was "completed successfully" but when I rebooted the device it got stuck at the splash screen. I can hear the ATT load chime but the AT&T icon is not displayed and that's it, stuck!!!!
I entered the HBoot and tried to access the recovery. The screen gets black with a red triangle icon in the center and the device reboot after several minutes. I think the Hboot message is no image.
When I connect the device to the computer it is recognized and I can access the files etc. but the ADB doesn't see the device any more.
I'm really lost and frustrated after hours and hours of reading and research without any luck.
Any help will be truly appreciated.
This is the device variables before I updated the firmware:
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.16.0.0000
(bootloader) version-baseband: 1.16.21331931.LA11G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: HT453WM01167
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(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: c3d94491
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
I look forward to your advice.
Thanks a lot in advance.
Click to expand...
Click to collapse
You have old, 4.4.2 firmware. That is the issue. Get new firmware and instructions on installing it here or here.

Thanks for getting back to me.
The firmware you see in the var. list I placed above is before I changed the Firmware.
As a result the phone is stuck on the splash screen.
I found post Firmware Flashing without the panic attacks... ; (you recommended) and followed the instructions.
The firmware update was complete...
Since that point the phone doesn't boot.
I did a Factory Reset yet still no change.
The most annoing fact is that I can get to the device with ADB.
When I type ADB Devices I get empty list

ronf0303 said:
Thanks for getting back to me.
The firmware you see in the var. list I placed above is before I changed the Firmware.
As a result the phone is stuck on the splash screen.
I found post Firmware Flashing without the panic attacks... ; (you recommended) and followed the instructions.
The firmware update was complete...
Since that point the phone doesn't boot.
I did a Factory Reset yet still no change.
The most annoing fact is that I can get to the device with ADB.
When I type ADB Devices I get empty list
Click to expand...
Click to collapse
ADB only works in custom recovery or when booted into OS
Fastboot will work on fastboot mode.
Do flash a custom recovery using fastboot. And also erase cache position before booting into custom recovery

It's working - I'm so happy
Hi guys,
Thanks for your support.
Bottom line - The phone is up and running ARHD Ver 21.
I repeated the whole process (flashing the firmware and the rom) but this time instead of flashing the FW I downloaded from the Revolution site (3.32.531.2) I flashed 3.32.531.2_Firmware_TMUS.ZIP I downloaded from
http://forum.xda-developers.com/htc-one-m8/development/firmware-flashing-panic-attacks-t2824048
So thanks so much for your support.
I'm really really happy

[Q] Having trouble getting lollipop

Seems everyone in Australia is recieving the OTA update for lollipop except me, i did have my phone rooted but returned to stock (i think) with this thread - http://forum.xda-developers.com/htc-one-m8/help/returning-phone-to-stock-htc-one-m8-t3004928
anyone able to figure out why I haven't received it yet? my getver all info is below
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.22.21331147A1.29G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.28.401.9
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: HTC__622
(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: df77f8b7
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.018s
any help would be appreciated.

Because your device is wrongly configured.
How can you have a device with EU MID but HKG CID then expect OTA to lollipop ?
How can you expect an OTA for Australia when your device not showing any Australia details ?
To have OTA you must have either of these CID/MID :
EU/EU
HKG/HKG
AUS/AUS

well that explains why, so how would i go about fixing this, all these numbers confuse the hell out of me.

You have to decide which region that you want your device to be ?
I don't think you originally have a AUS region. I believe it is a HKG device.
And I suggest to completely convert it to EU region which suit you more.
I'll tell you what to do after you made your decision.

ckpv5 said:
You have to decide which region that you want your device to be ?
I don't think you originally have a AUS region. I believe it is a HKG device.
And I suggest to completely convert it to EU region which suit you more.
I'll tell you what to do after you made your decision.
Click to expand...
Click to collapse
ill go EU, i ordered phone online so its not from Australia. also i greatly appreciate any help you provide, possibly expect a donation from me

Your MID is ready for EU version.
What you need to do :
1. Copy all your important files from Internal Storage to PC as this procedure will wipe everything in the phone and you'll have a new out of the box phone with lollipop.
2. Download 4.16.401.10 RUU ZIP : https://drive.google.com/file/d/0B17smFr95pleU2NqcVB3NWxoNnM/view
rename it ruu.zip
3. Download htc_fastboot.exe : https://drive.google.com/file/d/0B8L4pkbzdlR3eTlJSjdKVEdHX1U/view
4. Change your CID from HKG HTC__622 to SuperCID 11111111
boot your device to fastboot/bootloader and connect to PC where you'll see fastboot usb in red
run this command fastboot oem writecid 11111111
5. Put the downloaded htc_fastboot.exe at the same folder that you have your fastboot.exe; same goes the ruu.zip
6. Run this command
fastboot oem rebootRUU - this will put your device is RUU mode
htc_fastboot flash zip ruu.zip - this will erase everything in your device and replace it with the latest lollipop image
This process will take a few minutes, and the phone will reboot a few times but once done it'll say complete
7. Once completed, reboot run setup wizard ... done
8. Optional .. to flash a custom ROM, you need to install a custom recovery. I' using the latest TWRP 2.8.6.0
Note : there is no need to change your device from S-Off to S-On and there is no need to relock bootloader.
Credit to @EddyOS for the files from his thread : http://forum.xda-developers.com/showthread.php?t=2735235
Good luck ... I'll check your progress later when I'm home (in 3 hours)

downloading now, will report back shortly.

so far so good, up to the optimizing apps part, anything else i need to do? like change CID or anything? or will i be able to still get OTA updates in the future with 11111111?

No need to do anything else, leave it 11111111. You'll get OTA when there is one.

Thanks man, you literally have no idea I've been trying to figure all this out, enjoy the donation, don't go spending it all at once

Hey guys,
I'm also in two minds on which firmware I will need to flash to get Lollipop, my phone is s-off with twrp 2.7.0.3.
C:\ABDFAST>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.16.0.0000
(bootloader) version-baseband: 1.15.2133156.U
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: --
(bootloader) imei: --
(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: ab0efa49
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.110s
Please could someone which firmware file I need to flash in order to get lollipop, ultimate goal is to install custom CM12. When ever I try to install CM12 via twrp when selecting and trying to install the package I get an error saying that I cant install due to bootloader being 3.16.0.0000 and need to update to 3.18.0.0000 or 3.19.0.0000 and have been told that I require a firmware update to get this? Is this correct?
Thanks

Geoffr86 said:
Thanks man, you literally have no idea I've been trying to figure all this out, enjoy the donation, don't go spending it all at once
Click to expand...
Click to collapse
Thanks ... highly appreciated
Anything you want to ask, you can always PM me.

if i run into any problems ill remember that

Bricked to the Max... (Maybe)

Prologue:
So there I was, caressing my shiny and smooth M8.
At the beginning of the year I S-Offed, and added DigitalHigh's awesome Beyond Stock...
Later on, I used a standard RUU GPE Rom.
After repeated Wi-Fi password amnesia, I wanted Beyond Stock Back.
Flashing "GPE_5.1_M8_DH_080215.zip" gives me an "Error 7" even with repeated wipes... hehe... wipes
Searching didn't give me a coherent answer.
So I though, let's update TWRP... and...
Now
The thing's only usable in Bootloader.
If I go to recovery or ANYTHING, the "Google" logo stares at me in disgust.
Odd detail: I'm using fastboot and when it's stuck on the "Google" logo, entering "adb devices" detects the phone in recovery mode.
I flashed TWRP 2.8.7.0, but all I see is the "Google" logo. (I can still feel vibrations on the screen as if I'm hitting a menu button)
I also tried to "fastboot -w" and it gave me the "remote: not allowed" result.
Actually, I tried to fastboot a lot of things and the result came the same.
Anyways, I'll give a detailed log as soon as I remember how, but the reason I post this is 'cause searching for this doesn't give an understandable or reliable result.
Thanks
C:\WINDOWS\system32>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.18.0.0000
(bootloader) version-baseband: 1.14.21331931.LA02_2G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.11.1700.5
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(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: 6e0f5a3d
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.057s

Give the output of :
Fastboot getvar all
But delete the serial and imei before posting ! If you have an old bootloader you have to use the 2.7 series of TWRP. if you have the latest bootloader (3.18-3.19) you have to use 2.8 series of TWRP !

OOOOOOOOOHHHH, Where I get new M8 bootloader?
Hold Up, going to work, will post 'getvar' later today.

It's there, brah.
Take a look if you can.

It's an AT&T device, you are using it with AT&T ? And you fully converted it from sense to GPE ? You could also :
1: run the GPE ruu again. It will get you on GPE stock again and since you are s-off that should not be a problem of any kind.
2: convert back to sense (original AT&T with software number x.xx.502.x)
i am not sure if the AT&T RUU will cover the "back to sense conversion" so this might be interesting too as it involves the standalone flashing of the firmware first (you need a AT&T firmware, NOT the one posted there !!!)
here is more conversion info :http://forum.xda-developers.com/showthread.php?t=2733523
and here you can get firmwares : http://forum.xda-developers.com/showthread.php?t=2701376
if you want number 2 here is more info with a download link to the latest android L RUU : http://www.theandroidsoul.com/download-att-htc-one-m8-lollipop-ruu-4-28-502-1-75822/

Didnt want to start my own thread due to the shame..
Hi,,
I have managed to remove my OS, without making a backup. All i have running is TWRP. Was going to install CM12.1, but didnt update the M8 to the latest software that contains relevant bootloader. From here it went downhill - fast.
Ended up with no OS, no backkups, and no ability to flash other ROMS i think.
If someone could give me a few ideas, i would really appreciate it.
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.16.0.0000
(bootloader) version-baseband: 1.15.2133156.UA13G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: XXXXXXXXXXXX
(bootloader) imei: XXXXXXXXXXXXX
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: HTC__203
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: ab0efa49
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
Mike

Sheriff1972 said:
Hi,,
I have managed to remove my OS, without making a backup. All i have running is TWRP. Was going to install CM12.1, but didnt update the M8 to the latest software that contains relevant bootloader. From here it went downhill - fast.
Ended up with no OS, no backkups, and no ability to flash other ROMS i think.
If someone could give me a few ideas, i would really appreciate it.
Click to expand...
Click to collapse
Your case is different and you should start your own thread but there are many same case as yours.
Here is one and the solution is in there.. run RUU - http://forum.xda-developers.com/htc-one-m8/help/os-sos-t3192177
Anything you're not sure, ask there. Don't hijack this thread.

UPDATE: Thanks to ckpv5 and the links that were provided i was able to complete the reinstall - thank you so much!!
Opps - sorry - didnt mean to offend!
Will take a look.
Thanks
Mike

The RUU got me an OS and, right now, that is all I need.
Thank you!!

M8 stuck whilst loading recovery mode..

So i accidentally wiped the phone including the internal storage and the OS instead of factory resetting (wasn't paying attention) and tried to re install the android marshmallow OS onto the phone which didn't work..
i managed to flash the twrp by following another forum where someone had the same problem, using the adb process to flash the bootloader etc but now i can't access the recovery at all, it just says entering recovery and remains idle until i get bored of waiting and power off.
Can anyone help me?
i can provide whatever information is necessary for you to help, just need my phone revitalised as i desperately need it for my new job that i should hopefully be starting at the end of the week.
thanks in advance!

@mcg0v
post getvar all after removing serialno and imei
this info will help to know which RUU you need to flash and return your device to stock
any info you can provide is helpful

C:\Users\mcg0v\Desktop\Android\sdk-tools\sdk-tools>getvar all
'getvar' is not recognized as an internal or external command,
operable program or batch file.
C:\Users\mcg0v\Desktop\Android\sdk-tools\sdk-tools>fastboot getvar all
< waiting for any device >
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.55.0000
(bootloader) version-baseband: 4A.21.3263.04
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid: 00000000000000
(bootloader) product: m7_ul
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0710000
(bootloader) cidnum: HTC__001
(bootloader) battery-status: good
(bootloader) battery-voltage: 4266mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-bb768ae1
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.318s
Hope this helps, I'm really not that good with anything Android related as of yet, but i really need this phone fixed asap.

@mcg0v
you post your issue in the wrong forum
your device is HTC One m7
this forum is for HTC One m8
go to this thread http://forum.xda-developers.com/htc-one/general/lollipop-ruu-zip-small-collection-t3053944
this is for your device ask there some one will guide you

I have quite the same problem (and i have One M8). Can't enter TWRP recovery, bootloop - just shows an endless loading, i can start the phone without that by pushing pwr button/VOL+/VOL- at the same time (fastboot mode - ok). I want to get the stock back, but it's impossible without entering TWRP. Can someone help me please? It seems that i do not understand this thing anymore.
fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.16.0.0000
(bootloader) version-baseband: 1.15.2133156.UA13G
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: removed
(bootloader) imei: removed
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: VODAP102
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: ab0efa49
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.049s

andreech95 said:
I have quite the same problem (and i have One M8). Can't enter TWRP recovery, bootloop - just shows an endless loading, i can start the phone without that by pushing pwr button/VOL+/VOL- at the same time (fastboot mode - ok). I want to get the stock back, but it's impossible without entering TWRP. Can someone help me please? It seems that i do not understand this thing anymore.
Click to expand...
Click to collapse
Fastboot erase cache, then flash TWRP again in fastboot. Try TWRP 2.8.1.0, which is an older version (more compatible with your old firmware). Then see if you can boot into recovery.
Or flash signed firmware, to update firmware (yours is ancient) then flash TWRP 2.8.7 and restore a newer stock backup (corresponding to the firmware flashed).

redpoint73 said:
Fastboot erase cache, then flash TWRP again in fastboot. Try TWRP 2.8.1.0, which is an older version (more compatible with your old firmware). Then see if you can boot into recovery.
Or flash signed firmware, to update firmware (yours is ancient) then flash TWRP 2.8.7 and restore a newer stock backup (corresponding to the firmware flashed).
Click to expand...
Click to collapse
Thanks a lot. I've tried the first solution and at least TWRP is now working. I've tried the same thing, but it seems, that it was a wrong version of TWRP

Many apologies, turns out i misread the model and its actually the M7 i have. But im glad that this post is helping others with my original problem and thanks to other members who contributed to helping!
-mcg0v

HTC One M8 twrp-2.8.7.0 works, but twrp-3.x.x.x doesn't work

Hi Guys,
I want to revive my HTC One M8 (unlocked bootloader since 2014). Unfortunately, Installing the newest TWRP Image doesn't work. I tried install twrp-3.4.0-1-m8.img, but after I click in the bootloader "reboot recovery" or type "fastboot boot twrp.img" there is written on the screen for 0.1 seconds "entering recovery" but then the screen turns black.
So I tried different TWRP Versions, but the most recent version is twrp-2.8.7.0, but I can't use it to install Lineage OS 17.1.
Even the Lineage OS Recovery isn't working. Same here. After installing and entering recovery, the screen stays black (or the phone is off, not sure)
Any Ideas why it doesn't work? :/

Umm i have the same htc with the same problem as yours.I had unlocked bootloader since 2014 and TWRP 2.4 something worked flawlessly.When i updated to TWRP 3.4 the latest build it says entering recovery and it freezes,but it's actually a bug at least on mine,when i just double click Power button the screen flashes and it enters TWRP (I don't know it's weird).Try to getvar all so we know,what do you need exactly,because there is a high chance since you haven't touched your firmware since 2014,that your bootloader version will be smaller than 3.19 (which is needed to flash LineageOs) like mine.

snakeskaterthree said:
Hi Guys,
I want to revive my HTC One M8 (unlocked bootloader since 2014). Unfortunately, Installing the newest TWRP Image doesn't work. I tried install twrp-3.4.0-1-m8.img, but after I click in the bootloader "reboot recovery" or type "fastboot boot twrp.img" there is written on the screen for 0.1 seconds "entering recovery" but then the screen turns black.
So I tried different TWRP Versions, but the most recent version is twrp-2.8.7.0, but I can't use it to install Lineage OS 17.1.
Even the Lineage OS Recovery isn't working. Same here. After installing and entering recovery, the screen stays black (or the phone is off, not sure)
Any Ideas why it doesn't work? :/
Click to expand...
Click to collapse
I have a similar problem. With my htc m8, the TWRP only works up to version twrp-3.3.1-0-m8.img. Everything beyond that can supposedly be installed successfully (according to the adb terminal), but not started. That means that I cannot install the current Linage 17.xxx correctly.

Strange. I'm using 3.4.0-1 and it works flawlessly. I could install Lineage 17 two months ago with no problem at all
Have you tried to download the image for the M8 using the official TWRP app? to be sure that the image is correct

kadyt said:
Strange. I'm using 3.4.0-1 and it works flawlessly. I could install Lineage 17 two months ago with no problem at all
Have you tried to download the image for the M8 using the official TWRP app? to be sure that the image is correct
Click to expand...
Click to collapse
Yes, I am sure that I use the official version ?!

I'm having a very similar issue with a used phone I just bought. TWRP 2.8.7.0 works (but can't install the latest ROMs), but if I flash the latest version and try to reboot to recovery I end up back in the fastboot menu. This happens whether I use fastboot reboot recovery or the menu.
I have the AT&T version with the latest software I could download. Here's the fastboot information if it helps anyone:
Code:
$ fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.42.502.1
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: FA46EWM00439
(bootloader) imei: 358718051679624
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
(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: 56f9ae32
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
I'm going to keep digging for a bit, I'll post an update here if I figure anything out.

I got it! The firmware was out of date, but AT&T's updater wouldn't give me an OTA. I downloaded and flashed the Lollipop RUU exe from this thread (AT&T only) and all is well. New fastboot info below with updated version-baseband, version-main, and commitno-bootloader:
Code:
$ fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: [email protected]
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.28.502.1
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: FA46EWM00439
(bootloader) imei: 358718051679624
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: CWS__001
(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: 7f8e91a3
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
Hopefully others in this thread are having trouble for the same reason and can solve the problem by finding the latest RUU for their model.