Develop Bugs

[Q] Black screen of death please help!

ok so i flashed cynogenmod 7 today and i decided that i really wasnt that into it. I want to flash back to stock and when i did it the progress bar flashed red halfway through and the screen went to HTC black and silver with triangle with exclamation points in them. I tried getting tot he bootloader screen but when i push power and volume down button it just stays on the htc with triangles screen. Please help!

Bump. I can't help you but I feel so bad when people are desperate for help and don't get it. So here's a bump to get it noticed
Sent from my Optimus V

96camarors said:
ok so i flashed cynogenmod 7 today and i decided that i really wasnt that into it. I want to flash back to stock and when i did it the progress bar flashed red halfway through and the screen went to HTC black and silver with triangle with exclamation points in them. I tried getting tot he bootloader screen but when i push power and volume down button it just stays on the htc with triangles screen. Please help!
Click to expand...
Click to collapse
Were you running an RUU when thus happened? Was that how you were getting back to stock? How long has it been on that screen? If your sure its stuck, and is idle, I would do a battery pull, and then see if you can get to the bootloader. If you can, try running the RUU again, but put the phone in fastbood mode when you run the RUU. See if a second time gets it.
Sent from my PC36100 using XDA App

k2buckley said:
Were you running an RUU when thus happened? Was that how you were getting back to stock? How long has it been on that screen? If your sure its stuck, and is idle, I would do a battery pull, and then see if you can get to the bootloader. If you can, try running the RUU again, but put the phone in fastbood mode when you run the RUU. See if a second time gets it.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
I was running ruu and it failed. i have tried several times since including battery pulls and no luck. I keep trying to get to the bootloader but its stuck at that screen. It does not show up in my computer either when i plug it in but using an ruu still works.

When trying to get to bootloader, did you push power / volume down after phone was off? If not, pull battery. Put back in and then power/volume down.
You probably already did this but it sort of sounded like you tried getting to bootloader from the screen you were stuck on.
J
Bump
Sent from my PC36100 using XDA Premium App

The error i get when ruu fails is error 110 file open error. The rom update utility cannot open the requested files or the files are damaged. the ruu cannot continue with the update. Please get a complete ruu package and try again.

96camarors said:
I was running ruu and it failed. i have tried several times since including battery pulls and no luck. I keep trying to get to the bootloader but its stuck at that screen. It does not show up in my computer either when i plug it in but using an ruu still works.
Click to expand...
Click to collapse
When you shut your Evo off, and plug it into a wall (AC) plug, do you get a charging led? If you can still run an RUU, it sounds like maybe the one you are using is corrupt, or the wrong one all together. Do you know your bootloader version, software version, and radio versions? Likely you need to download the RUU that matches (or is very close to) your current versions.
I'm on the app, but would otherwise link you to a thread. In the dev section, search for "supersonic shipped roms", thread started by Esp28
Sent from my PC36100 using XDA App

ferfy67 said:
When trying to get to bootloader, did you push power / volume down after phone was off? If not, pull battery. Put back in and then power/volume down.
You probably already did this but it sort of sounded like you tried getting to bootloader from the screen you were stuck on.
J
Bump
Sent from my PC36100 using XDA Premium App
Click to expand...
Click to collapse
yeah i did that and nothing just stays at the screen

k2buckley said:
When you shut your Evo off, and plug it into a wall (AC) plug, do you get a charging led? If you can still run an RUU, it sounds like maybe the one you are using is corrupt, or the wrong one all together. Do you know your bootloader version, software version, and radio versions? Likely you need to download the RUU that matches (or is very close to) your current versions.
I'm on the app, but would otherwise link you to a thread. In the dev section, search for "supersonic shipped roms", thread started by Esp28
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
i am currently trying to download the 3.7 ruu but it keeps canceling itself. i do get a chargin led when plugged into wall. radio is 2.15

96camarors said:
i am currently trying to download the 3.7 ruu but it keeps canceling itself. i do get a chargin led when plugged into wall. radio is 2.15
Click to expand...
Click to collapse
Charging led is good. Find a good copy of the 3.70 RUU, make sure its a good download, and run again. When I get home ill link you to my RUU copy in my dropbox if you haven't found one yet.
Sent from my PC36100 using XDA App

k2buckley said:
Charging led is good. Find a good copy of the 3.70 RUU, make sure its a good download, and run again. When I get home ill link you to my RUU copy in my dropbox if you haven't found one yet.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
i found one that works and i have 46min to go. i found a good step-by-step fix for my problem http://androidforums.com/evo-4g-support-troubleshooting/254695-black-error-screen-when-updating-rooted-phone-supersonic-ruu.html and i am praying that it works for me. and thank you for your help so far!

96camarors said:
i found one that works and i have 46min to go. i found a good step-by-step fix for my problem http://androidforums.com/evo-4g-sup...hen-updating-rooted-phone-supersonic-ruu.html and i am praying that it works for me. and thank you for your help so far!
Click to expand...
Click to collapse
Cool, your welcome. I bet the good RUU will work. And yes, the other thread looked good. Did u run unrevoked forever? If so, did u flash the s on tool before running RUU?
Sent from my PC36100 using XDA App

k2buckley said:
Cool, your welcome. I bet the good RUU will work. And yes, the other thread looked good. Did u run unrevoked forever? If so, did u flash the s on tool before running RUU?
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
i didnt flash s on tool. and that was my problem, i am new to the evo world (just got it sunday) and i had motorola before so the rooting i am used to is way different than htc haha

You get it fixed yet?
Sent from my PC36100 using Tapatalk

96camarors said:
i didnt flash s on tool. and that was my problem, i am new to the evo world (just got it sunday) and i had motorola before so the rooting i am used to is way different than htc haha
Click to expand...
Click to collapse
Yea, the rooting world between different manufacturers differs greatly, apparently. The state you're currently in, you probably have no choice but to run the RUU again. Once you get it to successfully run, and you boot up, back to stock, you'll most likely still be S-off. Now, that's not necessarily bad, unless you're going to take your evo into sprint for any reason. If you leave it S off, if you ever want to reroot, all you'd have to do is flash a PC36IMG of a custom recovery, using the bootloader. At that point, you could flash a ROM or whatever. Also, if you do want to return it to S on, once the RUU completes and you can boot, flash a PC36IMG of a recovery, using the bootloader. At that point, flash the unrevoked S on tool, using recovery. Once you confirm that S is back to ON, then run the RUU again. Then you'll be back to stock, unrooted, S on.

RileyGrant said:
You get it fixed yet?
Sent from my PC36100 using Tapatalk
Click to expand...
Click to collapse
not fixed yet 5min left on download
k2buckley said:
Yea, the rooting world between different manufacturers differs greatly, apparently. The state you're currently in, you probably have no choice but to run the RUU again. Once you get it to successfully run, and you boot up, back to stock, you'll most likely still be S-off. Now, that's not necessarily bad, unless you're going to take your evo into sprint for any reason. If you leave it S off, if you ever want to reroot, all you'd have to do is flash a PC36IMG of a custom recovery, using the bootloader. At that point, you could flash a ROM or whatever. Also, if you do want to return it to S on, once the RUU completes and you can boot, flash a PC36IMG of a recovery, using the bootloader. At that point, flash the unrevoked S on tool, using recovery. Once you confirm that S is back to ON, then run the RUU again. Then you'll be back to stock, unrooted, S on.
Click to expand...
Click to collapse
ok thanks for the advice. ill probly go back to stock for awhile until i get used to the phone. so if i leave s off then nothing bad while happen with the ruu while im sleeping? i really need to get to sleep asap, got a full day of classes tomorrow haha.

96camarors said:
not fixed yet 5min left on download
ok thanks for the advice. ill probly go back to stock for awhile until i get used to the phone. so if i leave s off then nothing bad while happen with the ruu while im sleeping? i really need to get to sleep asap, got a full day of classes tomorrow haha.
Click to expand...
Click to collapse
I'm confused, haha. Nothing bad will happen with the RUU when you're sleeping? I think you do need some sleep brotha! Once you successfully run the RUU, and return to stock, you'll most likely still be S off, since you didn't flash the S on tool. This mean's you'll be on a stock ROM, with S off, and no recovery. Nothing bad will happen by leaving it like this, so long as you don't take it to Sprint with S off. Now, if you do just plan on staying stock for a while, you may want to return to S-on, just in case any unpredictable catastrophic events occur, you're better off having S-on, in case you need to take it back to Sprint. You can always root again rather easily. So I guess my suggestion is to flash a recovery once you're up and running, flash the S on tool, and then run the RUU again. Just to be safe. If you want to root again, you know how
Edit: ^^^^All that is providing you get the RUU to run successfully, which I think you will. You just need a good copy of the right version. If that doesn't work, don't forget you have other options. Such as flashing an RUU as a PC36IMG from the bootloader. Also, you can run an RUU with fastboot. So there is a plan B and C if that doesn't work.

k2buckley said:
I'm confused, haha. Nothing bad will happen with the RUU when you're sleeping? I think you do need some sleep brotha! Once you successfully run the RUU, and return to stock, you'll most likely still be S off, since you didn't flash the S on tool. This mean's you'll be on a stock ROM, with S off, and no recovery. Nothing bad will happen by leaving it like this, so long as you don't take it to Sprint with S off. Now, if you do just plan on staying stock for a while, you may want to return to S-on, just in case any unpredictable catastrophic events occur, you're better off having S-on, in case you need to take it back to Sprint. You can always root again rather easily. So I guess my suggestion is to flash a recovery once you're up and running, flash the S on tool, and then run the RUU again. Just to be safe. If you want to root again, you know how
Edit: ^^^^All that is providing you get the RUU to run successfully, which I think you will. You just need a good copy of the right version. If that doesn't work, don't forget you have other options. Such as flashing an RUU as a PC36IMG from the bootloader. Also, you can run an RUU with fastboot. So there is a plan B and C if that doesn't work.
Click to expand...
Click to collapse
ok thank you very much. it worked. thanks for all your help!

96camarors said:
ok thank you very much. it worked. thanks for all your help!
Click to expand...
Click to collapse
Sweet, glad to hear it worked. Take care.
Oh yea, are you S on or S off? My guess is S off, if you did use unrevoked forever before.

k2buckley said:
Sweet, glad to hear it worked. Take care.
Oh yea, are you S on or S off? My guess is S off, if you did use unrevoked forever before.
Click to expand...
Click to collapse
Yes I am currently s off

unsuccessful root

hey guys i bought this evo off ebay for 100 bucks. the guy tried to root but failed. which made the evo a "soft brick"
S-ON so its not actually rooted its still stock
hboot-2.16.0001
radio-2.15.00.05.02
when i tried to boot normally by just pressing the power button it come to the screen saying evo 4g then it goes black and comes back to the evo 4g screen. its in a loop
i tried this guide from another forum
http://forums.androidcentral.com/ht...568-how-unbrick-your-soft-bricked-evo-4g.html
unfortuneately it did not work.
this is my first android device. but i did flash/root lots of winmo phones which is kind of a similar process.
so any ideas that could help me out to try to get this workinng again?
thanks alot

you can't root your phone yet. and since you have s-on you might want to take it in. have your tried and pull the battery and boot up?

ocnbrze said:
you can't root your phone yet. and since you have s-on you might want to take it in. have your tried and pull the battery and boot up?
Click to expand...
Click to collapse
im not necessarily looking to root just trying to get it out of the loop..i might take it in tomorrow.
how can i boot without a battery??? i doint understand

well pull the battery out to stop the bootloop then put it back in and reboot

tried that now and its not working..I guess ill just go to the sprint store tomorrow.

You'll need to flash the RUU to restore it. Do you know what he tried to get it like that? It sounds like he was able to do something even if he couldn't finish it

xHausx said:
You'll need to flash the RUU to restore it. Do you know what he tried to get it like that? It sounds like he was able to do something even if he couldn't finish it
Click to expand...
Click to collapse
no i dont know but i can ask him.. i cant ruu through the computer so i put the pc36img on the sd and tried that way multiple times and its installs everything but then doesnt boot

when i try to re flash it from the sd card everything goes fine. i can even flash to a different radio software but the when it actually tries to boot it just loops.
so u think it might be hardware?????

just run the ruu

I had insurance on mine and dropped it in the bath on purpose....they replaced it
Sent from my PC36100 using XDA App

vabeachfc3s said:
just run the ruu
Click to expand...
Click to collapse
it doesnt go past the htv evo 4g screen. so how should i connect it??? via hboot??

i kinda forgot about this i still didnt solve this problem.
does anybody have any ideas on what i should do??

afgomar said:
i kinda forgot about this i still didnt solve this problem.
does anybody have any ideas on what i should do??
Click to expand...
Click to collapse
IDK if this will help but you can check out this thread on how to root 2.3 .
http://forum.xda-developers.com/showthread.php?t=1218386
Sent from my PC36100 using XDA App

linsalata28 said:
IDK if this will help but you can check out this thread on how to root 2.3 .
http://forum.xda-developers.com/showthread.php?t=1218386
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
yeah ive already gone through that thread...the problem is i can't get past the boot loader and the computer can not recognize the device.
btw its s-on so its not rooted which makes things even harder.

afgomar said:
yeah ive already gone through that thread...the problem is i can't get past the boot loader and the computer can not recognize the device.
btw its s-on so its not rooted which makes things even harder.
Click to expand...
Click to collapse
Yeah sorry I didn't know if you saw that. I have no idea how to fix that problem sorry.
Sent from my PC36100 using XDA App

Boot into HBoot. Run an official RUU like this one: http://goo-inside.me/supersonic/ruu/RUU_SuperSonic_S_Sprint_WWE_3.26.651.6_Radio_2.15.00.07.28_NV_1.40_release_140444_signed.exe. Then go to www.revolutionary.io and download and run the utility. Install the recovery and congratulations you're rooted. I hope this helps you.

nickelghandi said:
Boot into HBoot. Run an official RUU like this one: http://goo-inside.me/supersonic/ruu/RUU_SuperSonic_S_Sprint_WWE_3.26.651.6_Radio_2.15.00.07.28_NV_1.40_release_140444_signed.exe. Then go to www.revolutionary.io and download and run the utility. Install the recovery and congratulations you're rooted. I hope this helps you.
Click to expand...
Click to collapse
so when i run the ruu it doesnt work because it cant recognized the phone. thats my main problem.
does you evo get recognized by the computer when its in hboot/bootloader???
I might have a bad usb port on the phone. (its not the laptop cuz its brand new)

afgomar said:
so when i run the ruu it doesnt work because it cant recognized the phone. thats my main problem.
does you evo get recognized by the computer when its in hboot/bootloader???
I might have a bad usb port on the phone. (its not the laptop cuz its brand new)
Click to expand...
Click to collapse
Try running the ruu from fastboot, it should recognize it then. Fastboot is the first option in hboot.
Sent from my Evo + MIUI using Tapatalk!

plainjane said:
Try running the ruu from fastboot, it should recognize it then. Fastboot is the first option in hboot.
Sent from my Evo + MIUI using Tapatalk!
Click to expand...
Click to collapse
okay so i booted into hboot then clicked on fastboot while i am plugged in via usb. then ran the ruu and it still does not recognize the device.

afgomar said:
okay so i booted into hboot then clicked on fastboot while i am plugged in via usb. then ran the ruu and it still does not recognize the device.
Click to expand...
Click to collapse
Actually heading out, but make sure you have the drivers installed, and I think you need htc sync installed while running the RUU; so try that.

Radio Update Brick

Hello all, I am starting a new thread because the search is down and google is failing me.
I just updated to the newest radios with the combo zip in fastboot. no errors but upon completion i opted to reboot, shows android with box and arrow.
Am I officially bricked?
I can no longer access hboot, recovery, nothing.
plugging it into usb while hitting power or while android guy is up doesn't register anything on my pc.
any help is appreciated while the search function is down. ( already pricing another one )
for reference i was running cm7 stable with stock cm7 kernel, and was on Radio_2.15.00.09.01.

civicsr2cool said:
Hello all, I am starting a new thread because the search is down and google is failing me.
I just updated to the newest radios with the combo zip in fastboot. no errors but upon completion i opted to reboot, shows android with box and arrow.
Am I officially bricked?
I can no longer access hboot, recovery, nothing.
plugging it into usb while hitting power or while android guy is up doesn't register anything on my pc.
any help is appreciated while the search function is down. ( already pricing another one )
for reference i was running cm7 stable with stock cm7 kernel, and was on Radio_2.15.00.09.01.
Click to expand...
Click to collapse
If it completed successfully there shouldn't be any issue.
So when you turn it on it will boot to an android with a box and an arrow and just stay there forever?
If you can't access your bootloader or anything then it is likely you're bricked.

mattykinsx said:
If it completed successfully there shouldn't be any issue.
So when you turn it on it will boot to an android with a box and an arrow and just stay there forever?
If you can't access your bootloader or anything then it is likely you're bricked.
Click to expand...
Click to collapse
thats correct it boots directly to the android and box and arrow..
no search results for an evo jtag either

civicsr2cool said:
thats correct it boots directly to the android and box and arrow..
no search results for an evo jtag either
Click to expand...
Click to collapse
And pressing the volume down button while powering on yields the same result?

When you flash a radio that screen is the update screen don't battery pull let it run its course.
Sent from my PC36100 using Tapatalk

NVM all is well, i let it set for a few minutes. im ignorant i guess. thank you all for the help, you saved the day!

As Khilbron said, That is the screen that you see when it is updating the radio. It takes a while. Let if finish. Pulling the battery while it is flashing the radio is one of the only ways that you can truly brick your Evo. As long as you see that screen when the Evo powers up you may still be ok. Just let it finish. If you get nothing at all when the Evo powers up, just a black screen, then you are likely toast.

m20120 said:
As Khilbron said, That is the screen that you see when it is updating the radio. It takes a while. Let if finish. Pulling the battery while it is flashing the radio is one of the only ways that you can truly brick your Evo. As long as you see that screen when the Evo powers up you may still be ok. Just let it finish. If you get nothing at all when the Evo powers up, just a black screen, then you are likely toast.
Click to expand...
Click to collapse
thanks man. got it all figured out now. mods plz delete.

for anyone that may find this thread with a similar problem in the future. here is solution that worked in the radio thread.
http://forum.xda-developers.com/showpost.php?p=17041666&postcount=2668

civicsr2cool said:
thanks man. got it all figured out now. mods plz delete.
Click to expand...
Click to collapse
Have more patience.
That's why I asked if it "just stay there forever?"

mattykinsx said:
Have more patience.
That's why I asked if it "just stay there forever?"
Click to expand...
Click to collapse
i was ignorant and kinda thought to myself duh, but i guess not lol

I am glad that it worked out for you. I will have to admit that I kind of freaked out the first time I flashed the radio when I saw that screen but I did not touch it and it finished while I was googling to find out what was happening. I have no idea what HTC was thinking putting up a screen like that... why not any text along with the graphic? It would save many bricked evos.

Soft keys flashing then to CWM 5.8.2 cannot install rom

I'm fairly a noob when it comes to rooting and whatnot, however i've learned quite a bit since i've started. I rooted nexus s with no hassel. My friend the other day gave me a LG Nitro HD, the phone boots shows the LG logo then goes to the Clockworkmod touch 5.8.2. I have tried installing roms on it, it will install the rom and run then when i try to reboot, the soft keys will flash for 2 mins before showing the LG logo and going back to the Clockworkmod again. Keep in mind there is nothing on the SD card besides the signed_HO!NO!_p930 i have tried other os's too. I don't know exactly what he did to his phone. Please help me out. Thanks a bunch guys :laugh:

luqman91 said:
I'm fairly a noob when it comes to rooting and whatnot, however i've learned quite a bit since i've started. I rooted nexus s with no hassel. My friend the other day gave me a LG Nitro HD, the phone boots shows the LG logo then goes to the Clockworkmod touch 5.8.2. I have tried installing roms on it, it will install the rom and run then when i try to reboot, the soft keys will flash for 2 mins before showing the LG logo and going back to the Clockworkmod again. Keep in mind there is nothing on the SD card besides the signed_HO!NO!_p930 i have tried other os's too. I don't know exactly what he did to his phone. Please help me out. Thanks a bunch guys :laugh:
Click to expand...
Click to collapse
I am having the exact same issue here for two days now... I did a full back up prior to flashing yet still nothing and no matter what ROM I try I wind up back in CWM....
I am going to stop bye a shop were I know a guy that does rooting and such and take the phone to see...Will keep you posted from this side anxious to read what others may say.

Try following machzelets or mattman86's unbricking guide. Well thats if you can get into download mode.
Sent from my LG-P930 using xda premium

rani9990 said:
Try following machzelets or mattman86's unbricking guide. Well thats if you can get into download mode.
Sent from my LG-P930 using xda premium
Click to expand...
Click to collapse
I know I cannot get into download mode, Will be interested to see if Lugman can or not ... So unbricking is not an option at this point for me. Tried that yesterday also.
Lugman please post any progress sounds though we are in the same river of CWM... Why the HOX is so easy compared to this ....

Try charging it then do a battery pull then plug in the USB while holding the volume update. This should bring up a screen saying download mode. Then unbrick from there.
Sent from my LG-P930 using xda premium

rani9990 said:
Try charging it then do a battery pull then plug in the USB while holding the volume update. This should bring up a screen saying download mode. Then unbrick from there.
Sent from my LG-P930 using xda premium
Click to expand...
Click to collapse
Yes that worked that specific method, its in download mode however my laptop says that the device driver software was not successfully installed. I dunno what to do after this.

luqman91 said:
Yes that worked that specific method, its in download mode however my laptop says that the device driver software was not successfully installed. I dunno what to do after this.
Click to expand...
Click to collapse
You can go here:
http://www.lg.com/us/support-mobile/lg-P930#software
Download the drivers and have a blast... I dropped mine off at the shop to see if the guy can do something... He mentioned that he has seen some of this going on with CWM sticking he tried some methods and a couple different ROMS and also nothing. So I left it hoping I get the call that all is well in the AM.
Anyway GOOD LUCK ..

Thanks alot man, am gonna try all this out and see how it all works. I appreciate your help. am gonna post here what the progress is and whatnot. so check back!

luqman91 said:
Thanks alot man, am gonna try all this out and see how it all works. I appreciate your help. am gonna post here what the progress is and whatnot. so check back!
Click to expand...
Click to collapse
Great let us know... I have mine at the shop the guy is using the inbricking guide from here to do some magic (I hope) thought I would have the phone back today but told maybe tomorrow as it takes a long time to do the process...
Not sure I ever want to use CMW first will have to read up more on it....

HTC One M8 - help needed

hi its been a week now that i have not had a phone i have tried every thing i just cant get to grips with all the file changing and one thing and another so if theres any one out there that can take over my phone and get back running again i am willing to donate, thanks for now john

borstalsmurf said:
hi its been a week now that i have not had a phone i have tried every thing i just cant get to grips with all the file changing and one thing and another so if theres any one out there that can take over my phone and get back running again i am willing to donate, thanks for now john
Click to expand...
Click to collapse
Someone responded to you in the other thread and you never said anything back.
You need to outline exactly what you did, and exactly what is happening on your phone. Speak in complete sentences. People can only help you if you explain your situation clearly, because we're not in the room with you.

you are asking for help ? do it in the Q&A section, its made for a reason
and as been said above, you got responded there so keep it there. not reading those helpful hints there yet making a new thread in the wrong section is not correct !

soft brick htc m8
thebobmannh said:
Someone responded to you in the other thread and you never said anything back.
You need to outline exactly what you did, and exactly what is happening on your phone. Speak in complete sentences. People can only help you if you explain your situation clearly, because we're not in the room with you.
Click to expand...
Click to collapse
hi sorry for not explaining myself, i down loaded the htc m8 tool box i was not sure what i was doing i was trying too root the phone i managed to unlock the phone , i still have s-on i can get into fastboot usb, and thats it, i cant get into twrp.if press to go into recovery it goes as far as the white screen htc in green and thats it, it dont do nothing else unless i do start button and up volume if i go volume down it don't do nothing, that's about all i can tell u john

borstalsmurf said:
i down loaded the htc m8 tool box i was not sure what i was doing i was trying too root the phone i managed to unlock the phone , i still have s-on i can get into fastboot usb, and thats it, i cant get into twrp.
Click to expand...
Click to collapse
You need to install TWRP, before you can boot into TWRP.
borstalsmurf said:
it goes as far as the white screen htc in green and thats it, it dont do nothing else unless i do start button and up volume if i go volume down it don't do nothingn
Click to expand...
Click to collapse
If pressing vol down during a reboot doesn't get you to bootloader, you did it wrong. You either started pressing vol down to late, or let go too early (don't let go until the bootloader screen appears). Just try again, until it works.