i need help i bricked my htc one sv for boostmobile
k2_cl
hboot-1.01.0000
radio-1.12.50.0115
i cant get the phone to do any thing i can get it into recovery mode but back up wont install it says md5 not matching
is their any ruu out their or does any body have any way to force back up
i also have the new update is their any way to fix the phone with that
phone wont go past white logo saying htc wrnings
bignick0868 said:
i need help i bricked my htc one sv for boostmobile
k2_cl
hboot-1.01.0000
radio-1.12.50.0115
i cant get the phone to do any thing i can get it into recovery mode but back up wont install it says md5 not matching
is their any ruu out their or does any body have any way to force back up
i also have the new update is their any way to fix the phone with that
phone wont go past white logo saying htc wrnings
Click to expand...
Click to collapse
Can you please be more specific what you have done or what files you used?
bignick0868 said:
i need help i bricked my htc one sv for boostmobile
k2_cl
hboot-1.01.0000
radio-1.12.50.0115
i cant get the phone to do any thing i can get it into recovery mode but back up wont install it says md5 not matching
is their any ruu out their or does any body have any way to force back up
i also have the new update is their any way to fix the phone with that
phone wont go past white logo saying htc wrnings
Click to expand...
Click to collapse
well i unlocked my bootloader with htc.dev
then rooted with clockworkmod
then it was all good for awhile then the other day for some reason my phone just freezed up so i restarted the phone and nothing so i tried to do a wipe and reset thats when the phone got bricked
i have a back up but it wont install say md5 not match so it wont boot up at all and i cant find an original ruu for the phone
bignick0868 said:
well i unlocked my bootloader with htc.dev
then rooted with clockworkmod
then it was all good for awhile then the other day for some reason my phone just freezed up so i restarted the phone and nothing so i tried to do a wipe and reset thats when the phone got bricked
i have a back up but it wont install say md5 not match so it wont boot up at all and i cant find an original ruu for the phone
Click to expand...
Click to collapse
Which clockworkmod you used?`Link please!
bignick0868 said:
well i unlocked my bootloader with htc.dev
then rooted with clockworkmod
then it was all good for awhile then the other day for some reason my phone just freezed up so i restarted the phone and nothing so i tried to do a wipe and reset thats when the phone got bricked
i have a back up but it wont install say md5 not match so it wont boot up at all and i cant find an original ruu for the phone
Click to expand...
Click to collapse
i could only get into recovery mod and it say
clockworkmod recovery V6.0.2.8
But where did you download it?
The background is, you're on boostmobile and you have other partition layout as the other One SV User.
If you have the wrong recovery, it will always fail.
You can also have a look at this thread, seems to be very similar (also boost user).
If MD5 is returning with an error then this leaves two options. One, you have a corrupted backup of your device, or two, when you conducted your backup you did not conclude MD5 check along with it which means you have CWM set to conduct an MD5 check of your backup when there isn't any MD5 files for it to use and confirm.
My solution to you? Turn off the MD5 check and roll through with the backup once more. Should be fine at this point as I seriously doubt your backup is corrupted - unless you acquired this backup from someone else by downloading? Then it is plausible the download caused some problems (rare but can happen).
Sent from my C525c using XDA Premium 4 mobile app
Related
HI ALL,
i have unrooted my phone and then i,ve updated my phone but i forgot to remove clockworkmodrecovery now when i reboot my phone it keeps getting in recovery mode
Is there anyone who can help me?
I have the exact same problem!
I've tried restoring a backup, rebooting the phone, turning it off, install update from sdcard, formatting cache...
None to any avail. Please help!
I've tried about every option now, I've even tried downloading a ROM and flashing it to the phone. It still boots into Clockworkmod.
Can I throw my phone in the trash now?
Edit:
I don't have windows XP, so nope to unbricking your O3D guide.
Sdcard
I can only put the rom at my external sdcard i don know how to put someting in the internal flash
I've now tried flashing KingDroid.
It's still in the bootloop.
Why does it seem like no one even cares about this thread?
FPtje said:
I've now tried flashing KingDroid.
It's still in the bootloop.
Why does it seem like no one even cares about this thread?
Click to expand...
Click to collapse
People care but if they don't have an answer for you it's not much they can do, tried pulling the battery I guess and using CWM to reset battery data and reseting to factory defaults etc?
People arent answering because there is already a guide on the forum explaining exactly how to fix this.
Sent from my LG-P920 using XDA Premium App
Echts said:
People care but if they don't have an answer for you it's not much they can do, tried pulling the battery I guess and using CWM to reset battery data and reseting to factory defaults etc?
Click to expand...
Click to collapse
I have tried about every single option in the CWM menus, and I've tried pulling the battery at random times.
None of them worked.
I'm now going to remove Arch Linux from my PC to make room for windows XP. Sorry for my previous outrage.
Next time remove CWM from your phone before updating...
I just installed windows XP and followed the guide to the letter. I am now stuck with the firmware update screen. How do I get rid of this?
Flash rom
I,ve managed to flash the rom with the original v10D but itÅ› still booting in clockwork recovery mode pfffff
These phones really are hard to unbrick.
Tell me please how to exit Rekaveri. Reloading and pulling the battery does not helps, it means everything? brick?
serano3d said:
Tell me please how to exit Rekaveri. Reloading and pulling the battery does not helps, it means everything? brick?
Click to expand...
Click to collapse
If you're stuck at the "updating firmware" screen like me, you're simply ****ed.
http://forum.xda-developers.com/showthread.php?t=1197108
use LG vip service.
I just called them, they said they'd "assess" my situation and that they'd call me back to tell me whether they'll replace it...
restore
Hi,
I have managed to restore a backup image but he is still booting in clockwork recovery what am i forgetting ????
Sincerely Snellie1972
Recover
I have recovered the phone with clockwork recovery with stock file
Optimus 3D 10D pre-rooted CWM restore but still it goes in too clockwork recovery at boot
What am i doing wrong ????
Thanks in advance
snellie1972
Unfortunately I was also able to get passed the clockwork screen but the phone is stuck on the update just like anybody else. I contacted the store where I bought it from and they sent me a prepaid box already to send it to them for repair/replacement.
As everyone says, at the moment it's not possible to recover from that state, sorry snellie.
If you still get the clockwork, then just follow these instructions but even so, you wont get passed the software update screen.
Flash
I have managed to flash using first de KDZ tool from LG en after that i have used te LGMOBILE update tool and just put in my imei and serial and it was downloading and restoring my phone so far so good but when it was Finished without any error it is still haging on update software ...
I don't understand why it is not going any further
Greetz
snellie1972
It's almost as if this firmware update screen is fake and an indicator for LG to see you ****ed your phone up.
Is there any known hacker even working on this?
Is my HTC Desire S bricked? It is stucked at the white HTC boot screen.
In september I got the MIUI rom up and running, now when I am about to sell my phone, I decided to go back and restore it. So I changed the ROM and then it wouldn't update it just stucked at exclamation point-screen, so I searched forums and found that I had to flash it. So I did with this one: RUU_Saga_HTC_Europe_1.28.401.1_Radio_20.28b.30.0805U_38.03.02.11_M_release_177977_signed.exe
Which I got from a list in this forum, went fine and my phone booted allright, so I went in and tried to update it via settings, it installed and now it is stucked at this white HTC bootscreen.
Is it bricked, or what do I do now?
Thanks.
download RUU_Europe_2.10.401.8 and use it
amidabuddha said:
download RUU_Europe_2.10.401.8 and use it
Click to expand...
Click to collapse
Doens't work either. I get "Error 170, usb-connectionerror" (I dont know if 100% correct translated).
So what now?
ZekkoDK said:
Doens't work either. I get "Error 170, usb-connectionerror" (I dont know if 100% correct translated).
So what now?
Click to expand...
Click to collapse
When I install new rom. It is always stuck at HTC bootscreen. I tried to put my finger some where on the screen. I repeated again and again on random positions on the screen until the language setting screen appear.
nmdang said:
When I install new rom. It is always stuck at HTC bootscreen. I tried to put my finger some where on the screen. I repeated again and again on random positions on the screen until the language setting screen appear.
Click to expand...
Click to collapse
Well that sounds ****ed
Unfortunately that doesn't work neither ... Any ideas?
Btw, thanks for the help
Well, I found out that I can go in to the fastboot mode, from revolutionary.
Isn't it called fastboot? Where you can choose factory reset, recovery etc.
Factory reset and recovery doesn't work though, when I try to recover I see a screen with a HTC Desire (not S) and a exclamation mark on it, what now?
Guys - I need help. I think i just blew my phone.
I flashed THE Sense-O-Maniac ICE ROM after a clean wife and my phone wouldn't boot. It kept getting stock on the Beats Logo. So I rewiped everything and reflashed this ROM. - Same result.
I then thought, maybe I should also update the firmware, though I am pretty sure, that my firmware was up to date.
So i reflashed the firmware on phone but it still wouldnt boot.
I took the memory card out and deleted the the firmware file so that I could not flash another rom. But when I tried to boot in Recovery my screen just went blank.
JUST BLANK
When I switch my phone on, I get a blank screen. The screen does light up though, but nothing shows.
If i connect the phone to USB, then the screen again lights up, even without the batter.
Has my phone gone poof??? Please help.
clean wife.
and why do u keep reflashing sense o maniac? why not try other rom?
Did you update your kernel or tried to use backup or install just old ROM, so far it doesn't sound bricked but just something missing, what was your previous ROM?
Sent from my HTC Sensation Z710e using XDA
Wrong section! This is not Q&A or Sensation General!
guptadh said:
Guys - I need help. I think i just blew my phone.
I flashed THE Sense-O-Maniac ICE ROM after a clean wife and my phone wouldn't boot. It kept getting stock on the Beats Logo. So I rewiped everything and reflashed this ROM. - Same result.
I then thought, maybe I should also update the firmware, though I am pretty sure, that my firmware was up to date.
So i reflashed the firmware on phone but it still wouldnt boot.
I took the memory card out and deleted the the firmware file so that I could not flash another rom. But when I tried to boot in Recovery my screen just went blank.
JUST BLANK
When I switch my phone on, I get a blank screen. The screen does light up though, but nothing shows.
If i connect the phone to USB, then the screen again lights up, even without the batter.
Has my phone gone poof??? Please help.
Click to expand...
Click to collapse
try "adb reboot recovery" continuously when booting the phone, ignoring all of the "error: device not found"
Boot while holding the volume down key (meaning power btn+ vol-). that should take you to the boot loader. once you're there, go to fastboot and flash a recovery image. you seem to have corrupted yours.
I had the same troubles with that rom.
Sent from my Sensation using xda premium
frost_icewind said:
Boot while holding the volume down key (meaning power btn+ vol-). that should take you to the boot loader. once you're there, go to fastboot and flash a recovery image. you seem to have corrupted yours.
Click to expand...
Click to collapse
I have already tried this continuously. No result with pressing boot with holding the volume key at all!! If I could do that, I knew i would be fine.
jufa2401 said:
I had the same troubles with that rom.
Sent from my Sensation using xda premium
Click to expand...
Click to collapse
What did you finally do ?
IMarks said:
Did you update your kernel or tried to use backup or install just old ROM, so far it doesn't sound bricked but just something missing, what was your previous ROM?
Sent from my HTC Sensation Z710e using XDA
Click to expand...
Click to collapse
I was using AOSP rom before this! I just can't get anything to show up on the screen no matter how I try!~
guptadh said:
What did you finally do ?
Click to expand...
Click to collapse
Use a different ROM?
Moon2 said:
try "adb reboot recovery" continuously when booting the phone, ignoring all of the "error: device not found"
Click to expand...
Click to collapse
i have been trying to do this for the past 10 mins, but I cant get anything.
All i keep getting is error:device not found.
The computer too does not give any indication of any device being connected to the Usb port..
You should boot into bootloader (vol- & power) then flash a stock gb ruu. After this you can proceed to s-off, root, firmware ... Etc
Sent from my HTC Sensation XE with Beats Audio Z715e using XDA
guptadh said:
i have been trying to do this for the past 10 mins, but I cant get anything.
All i keep getting is error:device not found.
The computer too does not give any indication of any device being connected to the Usb port..
Click to expand...
Click to collapse
have u try install new PG58IMG
with firmware 3.32 in an 4ext recovery in then it will start up in recovery again
Jeeez guys. He can't flash a PG58IMG because he CANT GET TO BOOTLOADER! I'm sorry I don't have am answer for you bit I want these people to stop giving you dumb answers that may lead to false hope. It might be bricked. I can't see anything you could do. Sorry
Sent from my HTC Sensation Z710e using XDA
what is the phone detected as when you connect it to your computer?
Sensation-al! said:
Jeeez guys. He can't flash a PG58IMG because he CANT GET TO BOOTLOADER! I'm sorry I don't have am answer for you bit I want these people to stop giving you dumb answers that may lead to false hope. It might be bricked. I can't see anything you could do. Sorry
Sent from my HTC Sensation Z710e using XDA
Click to expand...
Click to collapse
Thanks !! finally for getting it! The screen is just blank.. I can't get into bootloader!
RussianBear said:
what is the phone detected as when you connect it to your computer?
Click to expand...
Click to collapse
The phone is not detected on the PC!! I am afraid, the phone might be bricked.
I hope i can get get it repaired in warranty!!
guptadh said:
Guys - I need help. I think i just blew my phone.
I flashed THE Sense-O-Maniac ICE ROM after a clean wife and my phone wouldn't boot. It kept getting stock on the Beats Logo. So I rewiped everything and reflashed this ROM. - Same result.
I then thought, maybe I should also update the firmware, though I am pretty sure, that my firmware was up to date.
So i reflashed the firmware on phone but it still wouldnt boot.
I took the memory card out and deleted the the firmware file so that I could not flash another rom. But when I tried to boot in Recovery my screen just went blank.
JUST BLANK
When I switch my phone on, I get a blank screen. The screen does light up though, but nothing shows.
If i connect the phone to USB, then the screen again lights up, even without the batter.
Has my phone gone poof??? Please help.
Click to expand...
Click to collapse
Sjeez mate, what is your problem?
Posting here and in my thread with the same issue.
Without any detailed issue report.
I offered my help in my thread and tried to contact you for several days now via PM.
So i can help you out of this mess via Talk or IRC.
But if you fail to reply to me which i see as not accepting my help.
Sort it out for your self and going on by nailing me down.
But don't say i didn't want you to help.
With regards,
The cook of this rom who seems to killed his phone.
Hello. I have a TMO HTC Sensation that i was able to root and get S-Off. I have changed roms a few times with out a problem. Last night I tried to install
[ROM][RC]AOKP "Initiate Your Swagger"[4.1.2][Nov 22][OTA][1080p]
I went into HBOOT, Factory Reset. I did a full wipe and wiped the cache. I then installed the new rom. When i rebooted the phone it would load up let me pick a language but then boot loop. I went back to HBOOT to do a a full wipe again but cant. I can scroll up and down but cant select anything. If I try to select anything it will go to the the HTC boot screen and freeze. Can anyone help me?
GreenBioHazard said:
Hello. I have a TMO HTC Sensation that i was able to root and get S-Off. I have changed roms a few times with out a problem. Last night I tried to install
[ROM][RC]AOKP "Initiate Your Swagger"[4.1.2][Nov 22][OTA][1080p]
I went into HBOOT, Factory Reset. I did a full wipe and wiped the cache. I then installed the new rom. When i rebooted the phone it would load up let me pick a language but then boot loop. I went back to HBOOT to do a a full wipe again but cant. I can scroll up and down but cant select anything. If I try to select anything it will go to the the HTC boot screen and freeze. Can anyone help me?
Click to expand...
Click to collapse
no man don't worry it's just freeze or bootloop, kill your phone or ur phone is dead means the board burned! u just want to flash ur official ROM and root it and CWM and just install ur favorite ROM!
Thanks for the reply. Im going to try that now. Hopefully it works. Whenever I press the power button to select an option from the HBOOT menu screen all it those is go to the HTC boot screen and freeze. Will report back.
Did you update the firmware to the latest? If not than that might be the issue.
Sent from my HTC Sensation using xda app-developers app
Ok now i know my phone is dead. It wont turn on, not to rom or HBOOT. it lights up like its charging but nothing works. What can i do now????
OK after taking the battery out a few times and trying to turn it on i got the phone to the white HBOOT screen. I tried to run the RUU but it wont recognize the phone. What should i do???
GreenBioHazard said:
OK after taking the battery out a few times and trying to turn it on i got the phone to the white HBOOT screen. I tried to run the RUU but it wont recognize the phone. What should i do???
Click to expand...
Click to collapse
Run the ruu with phone connected from bootloader... Precisely if connected properly phone shows FASTBOOT USB if it is showing HBOOT then press power button once and it will take the phone to FASTBOOT USB mode
Sent from my HTC Sensation using xda premium
Tried To Root HTC ONE S but now its stuck on this build is for development purposes only
plz help its not turning on when i turn it on it will stuck on this build is for development purposes only
i think i installed wrong boot file any1 have orignal htc one s boot file?
gurjivan said:
Tried To Root HTC ONE S but now its stuck on this build is for development purposes only
plz help its not turning on when i turn it on it will stuck on this build is for development purposes only
i think i installed wrong boot file any1 have orignal htc one s boot file?
Click to expand...
Click to collapse
Can you enter fastboot mode?
LS.xD said:
Can you enter fastboot mode?
Click to expand...
Click to collapse
Yes it going in fastboot mode
but not in recovery also it will stuck on entering recovery
gurjivan said:
Yes it going in fastboot mode
but not in recovery also it will stuck on entering recovery
Click to expand...
Click to collapse
Best way is to flash the matching RUU. Whats your CID?
LS.xD said:
Best way is to flash the matching RUU. Whats your CID?
Click to expand...
Click to collapse
Cid = OPTUS001
gurjivan said:
Cid = OPTUS001
Click to expand...
Click to collapse
Is your phone the Ville C2 (S3) model?
I have a very similar problem
gurjivan said:
Tried To Root HTC ONE S but now its stuck on this build is for development purposes only
plz help its not turning on when i turn it on it will stuck on this build is for development purposes only
i think i installed wrong boot file any1 have orignal htc one s boot file?
Click to expand...
Click to collapse
I had previously rooted by ONE S T-Mobile version and it had been working fine. I then decided to try out another rom. I likely flashed an incorrect boot img because it would only reboot into fastboot, but would still allow me to go into recovery. I went to recovery and restored my nandroid backup; however, now the phone will get stuck on the opening HTC screen the red language on the bottom, "this build is for development purposes only." It will hang on this screen for about 20 seconds and then turn off. No loop. When I attempt to power up again, I get a quick horizontal flash of light across my screen and then the orange LED comes on in the top left corner indicating the phone is charging. I then hold down power and again the phone gets stuck on the opening HTC screen with the red language.
Any advice regarding a remedy would be much appreciated.
chrons6 said:
I had previously rooted by ONE S T-Mobile version and it had been working fine. I then decided to try out another rom. I likely flashed an incorrect boot img because it would only reboot into fastboot, but would still allow me to go into recovery. I went to recovery and restored my nandroid backup; however, now the phone will get stuck on the opening HTC screen the red language on the bottom, "this build is for development purposes only." It will hang on this screen for about 20 seconds and then turn off. No loop. When I attempt to power up again, I get a quick horizontal flash of light across my screen and then the orange LED comes on in the top left corner indicating the phone is charging. I then hold down power and again the phone gets stuck on the opening HTC screen with the red language.
Any advice regarding a remedy would be much appreciated.
Click to expand...
Click to collapse
You need to flash the boot.img included in the rom via fastboot after restoring your backup.
Sent from my beloved HTC One S using (most time buggy) Tapatalk
LS.xD said:
You need to flash the boot.img included in the rom via fastboot after restoring your backup.
Sent from my beloved HTC One S using (most time buggy) Tapatalk
Click to expand...
Click to collapse
Thank you for trying to help. I understand what you are saying; however, my problem is that I cannot get the phone into fastboot.
chrons6 said:
Thank you for trying to help. I understand what you are saying; however, my problem is that I cannot get the phone into fastboot.
Click to expand...
Click to collapse
When p hone is on you'll have to power it off manually by pressing power for 10+ seconds. Then you should be able to enter the bootloader and fastboot. (Vol down + power) No matter if you have flashed a wrong kernel.
LS.xD said:
When p hone is on you'll have to power it off manually by pressing power for 10+ seconds. Then you should be able to enter the bootloader and fastboot. (Vol down + power) No matter if you have flashed a wrong kernel.
Click to expand...
Click to collapse
Thanks for the advice on how to enter the bootloader. Unfortunately, no matter how many times I try, using your method and a variety of other methods, I still can't get past "HTC developmental purposes only" screen. I'm not new to android and have experience with a number of phones, but this is my first HTC. Pretty frustrating thus far.
I'm to the point where I'd love to send the phone to someone who could RUU it and send it back.
chrons6 said:
Thanks for the advice on how to enter the bootloader. Unfortunately, no matter how many times I try, using your method and a variety of other methods, I still can't get past "HTC developmental purposes only" screen. I'm not new to android and have experience with a number of phones, but this is my first HTC. Pretty frustrating thus far.
I'm to the point where I'd love to send the phone to someone who could RUU it and send it back.
Click to expand...
Click to collapse
does the pc recognize the phone via usb?? you could try with using CMD script to boot into bootloader... i think there is one present on windroid:
http://forum.xda-developers.com/showthread.php?t=2471151
as you say you are already HTC-savvy, so its worth a try before you dish out any money on it!!
zubeedubs said:
does the pc recognize the phone via usb?? you could try with using CMD script to boot into bootloader... i think there is one present on windroid:
http://forum.xda-developers.com/showthread.php?t=2471151
as you say you are already HTC-savvy, so its worth a try before you dish out any money on it!!
Click to expand...
Click to collapse
Thanks for the help.
Thankfully I finally figured out how to consistently get my phone to enter into Fastboot; however, no the trouble I'm having is finding the proper RUU. I've tried the 3 T-mobile varients available in the RUU depository found here
http://forum.xda-developers.com/show....php?t=2094414
But alas, while I am able to run the RUU program, which enters my phone into a mode where the screen is all black expect for the HTC logo in the middle, I keep on getting error codes. Are there more than 3 RUU varients identified in the depository?
Oh, I should note that I was also able to get into recovery, but my SD was unable to mount so I can't find my Nandroid.
Also, while the RUU program recongizes that I have my phone attached, the Hasson utility does not, nor does my computer.
Which error code?
Sent from my beloved HTC One S using (most time buggy) Tapatalk
LS.xD said:
Which error code?
Sent from my beloved HTC One S using (most time buggy) Tapatalk
Click to expand...
Click to collapse
Error 155: Unknown Error
Please get the correct ROM update utility and try again.
I flashed the stock recovery and tried to use 4 different RUUs, but no luck.
RUU_Ville_U_ICS_40_S_TMOUS_2.35.531.7_Radio_1.08ts.50.02.16_10.08e.50.04L_release_279577_signed
RUU_Ville_U_TMOUS_1.84.531.2_R2_Radio_0.16.31501S.16_2_10.22.31501S.10L_release_263233_signed
RUU_Ville_U_TMOUS_1.53.531.16_Radio_0.16.31501S.02_10.18.31501S.08L_release_262073_signed
RUU_Ville_U_JB_45_S_TMOUS_3.14.531.11_Radio_1.13.50.05.31_10.30.50.08L_release_309489_signed_ICS_2
chrons6 said:
Error 155: Unknown Error
Please get the correct ROM update utility and try again.
I flashed the stock recovery and tried to use 4 different RUUs, but no luck.
RUU_Ville_U_ICS_40_S_TMOUS_2.35.531.7_Radio_1.08ts.50.02.16_10.08e.50.04L_release_279577_signed
RUU_Ville_U_TMOUS_1.84.531.2_R2_Radio_0.16.31501S.16_2_10.22.31501S.10L_release_263233_signed
RUU_Ville_U_TMOUS_1.53.531.16_Radio_0.16.31501S.02_10.18.31501S.08L_release_262073_signed
RUU_Ville_U_JB_45_S_TMOUS_3.14.531.11_Radio_1.13.50.05.31_10.30.50.08L_release_309489_signed_ICS_2
Click to expand...
Click to collapse
You need to relock the bootloader before you run the RUU
And if your CID is Optus001 and you're S-ON you can't use T-Mobile RUUs (T-MOB010)
LS.xD said:
You need to relock the bootloader before you run the RUU
And if your CID is Optus001 and you're S-ON you can't use T-Mobile RUUs (T-MOB010)
Click to expand...
Click to collapse
I got my phone back! Thanks for the help. Your advice was spot on. What a terrific community of people. I hope that others will be able to follow this thread and fix similar issues.
chrons6 said:
Thanks for the help.
Thankfully I finally figured out how to consistently get my phone to enter into Fastboot;
Click to expand...
Click to collapse
How did you enter the fast boot?
I was playing with System Files because of the low mic volume problem, rebooted and since then the phone does exactly like yours: 20sec of "this build is for development purposes only" then it switches off.
All button-combinations tried.
The PC in Printer and Devices sees it as an Android Phone, Device Manager sees a HTC MTP Device, but I don't see it in Windows Explorer.
Adb do not see any connected device.
I guess I have to change the motherboard.