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Z3 always boots to fastboot mode only when it connected to pc

"Z3 always boot to fastboot mode with blue led only when it connected to pc for charging not data transferring"
and otherwise i can not even start the phone via power key cuz it doesnt work when phone is off.
but power key works only if it is connected to pc and screen will be open at the same time. but only into charge screen android will not open.
what kind of brick is this? what could i do ?
i have flashtool installed on my laptop.
i checked, phone can be on flash mode via flashtool but i dont even have internet to dowload some OS to flash it. right now.
flashtool's "reboot device into system" key. i tried it does nothing.
actually i may let it sercive even if i will fix this or not.
cuz maybe they will renew it.
its my 12th month of the warranty. so ther is still guarantee.
but once i changed bootloader. to flash some other os
if im not mistaken. i assume it will broke warranty....
any way to change back this setting to fabric default. (bootloader)
does flashtool do it ? i clicked "relock" on flashtool. so its done ?
also i want wipe my phone if it will go to service. how can i
please leave a reply i don't even have internet cuz im on vacation, typing on someones phone
i bet i can't search on forum with that limited situation.

Please help me

Hi
I've made a bad mistake which I'm hoping people can help me with. I tried updating my phone wit MIUI 8 as I had an issue with my battery. My updater app on my phone was not working so I downloaded zip file and tried doing it manually from the app. Then my phone just turned off and I'm unable to turn on or charge. None of the button combinations work and when I plug in to my laptop through usb port I get a message saying it doesn't recognise device. I've tried using unlock function on website but get error messages in chinese around ip address to malfunctioned phone number so no luck there.
Appreciate any help as I had a lot of information, apps and data that i would hate to lose. I lost my wife 3 months ago and I have some precious memories on that phone. I know I should have done a backup beforehand and that was stupid of me.
Is there anyway i get can my back in without losing data. if not then anyway at all to get my phone working.
Thanks, from a very down MI4C user

Try holding one of the power buttons(don't remember which one) and plug in the cable so the phone boots into fastboot mode. If you manage to get into fastboot boot TWRP and copy your files straight from it as it has mtp support. If your PC sees your phone as an unrecognizable device there's a big chance you can recover your data. Last hope would be to use a modified usb cable for edl flashing although this way you'll most likely lose your data.

Adi393 said:
Try holding one of the power buttons(don't remember which one) and plug in the cable so the phone boots into fastboot mode. If you manage to get into fastboot boot TWRP and copy your files straight from it as it has mtp support. If your PC sees your phone as an unrecognizable device there's a big chance you can recover your data. Last hope would be to use a modified usb cable for edl flashing although this way you'll most likely lose your data.
Click to expand...
Click to collapse
Thanks, first suggestion doesn't work unfortunately. I have now been given permission to unlock bootloader but problem is the device is not recgonised due to usb issue.
So I cant turn on, won't charge etc and none of button combinations work. Has anyone encountered the issue with usb before. Unsure of 'modified usb cable for edl flashing'. All very frustrating.
thanks for any help

Anyone else have any ideas. Desperate here without my phone and important data

Have tried everything at this stage...utter despair. My phone just won't turn on or charge or enter fastboot mode etc
Anyone please help

The modified USB cable that I spoke of is used to force boot the phone into emergency download mode. It's baisicly a last hope flashing method that should work regardless of how broken the phone is. The only downside is that using this mode you only can flash via miflash and this will wipe your data. As for the cable you can either make one (look for deep flash USB cable schematic, it involves swapping 2 wires) or just buy one. Once you get into edl just follow the unofficial bootloader unlock guide to flash the 6.1.7 rom as it is flashed in the emergency mode.
Edit: whenever you plug your phone into your PC does the screen or led diode light up at all? You can also try holding vol- and power button and plug the phone into a charger (not PC) to see if it will respond at all. Charger gives more current so maybe it will force the phone to boot.

Adi393 said:
The modified USB cable that I spoke of is used to force boot the phone into emergency download mode. It's baisicly a last hope flashing method that should work regardless of how broken the phone is. The only downside is that using this mode you only can flash via miflash and this will wipe your data. As for the cable you can either make one (look for deep flash USB cable schematic, it involves swapping 2 wires) or just buy one. Once you get into edl just follow the unofficial bootloader unlock guide to flash the 6.1.7 rom as it is flashed in the emergency mode.
Edit: whenever you plug your phone into your PC does the screen or led diode light up at all? You can also try holding vol- and power button and plug the phone into a charger (not PC) to see if it will respond at all. Charger gives more current so maybe it will force the phone to boot.
Click to expand...
Click to collapse
Thanks Adi. I don't think I will be able to make one. I've seen some threads elsewhere about getting into EDL mode, do you always require modified cable to do so?
Nohting happens when I plug it into PC, no lights etc. Tried charging using normal power supply but nothing happens either. Have even tried connecting to powerbank overnight but no power is taken from it.

colb16 said:
Thanks Adi. I don't think I will be able to make one. I've seen some threads elsewhere about getting into EDL mode, do you always require modified cable to do so?
Nohting happens when I plug it into PC, no lights etc. Tried charging using normal power supply but nothing happens either. Have even tried connecting to powerbank overnight but no power is taken from it.
Click to expand...
Click to collapse
So there is no "unrecognized device" popping up in windows anymore?
If so, let the phone lie for 1 more day (without connecting any power sources to it). Afterwards charge it (with a normal charger and a cable that works for another phone) for about 2 days (or until you see the notification led charging). if nothing happens you can try a different charger or an usb port for another 2 days.
If your computer recognizes the device ("unrecognized device" or just any reaction by connecting the phone) try to reinstall all the drivers (xiaomis/qualcoms, as well as adb, fastboot) and see if there is something happening.
Report back if it helped.
Edit: Did you try different cables? had similar problems with op2 (not recognizing) with xiaomi cable...
Edit2: to make sure the device is completely dead, use a linux distro (e.g. Ubuntu, ensures that there are no driver problems, you can install it on a usb drive) and a cable which surely works (try it on at least 2 other phones, if data transfer works its ok) then first install fastboot (ctrl+t to open a terminal) by copy/pasting "sudo apt-get install android-tools-adb android-tools-fastboot". Afterwards hold vol- and power button for at least 12secs and plug mi4c in (release the buttons after plugging it in). Now you can run "sudo fastboot devices" and see if there is sth listed (should even recognize it in edl).

colb16 said:
Thanks Adi. I don't think I will be able to make one. I've seen some threads elsewhere about getting into EDL mode, do you always require modified cable to do so?
Nohting happens when I plug it into PC, no lights etc. Tried charging using normal power supply but nothing happens either. Have even tried connecting to powerbank overnight but no power is taken from it.
Click to expand...
Click to collapse
You don't need to use the modified cable as you can enter edl from fastboot, but the cable method is used to force the phone into it if you can't enter it the normal way. As for rescuing it, try the method @wertus33333 suggested.

wertus33333 said:
So there is no "unrecognized device" popping up in windows anymore?
If so, let the phone lie for 1 more day (without connecting any power sources to it). Afterwards charge it (with a normal charger and a cable that works for another phone) for about 2 days (or until you see the notification led charging). if nothing happens you can try a different charger or an usb port for another 2 days.
If your computer recognizes the device ("unrecognized device" or just any reaction by connecting the phone) try to reinstall all the drivers (xiaomis/qualcoms, as well as adb, fastboot) and see if there is something happening.
Report back if it helped.
Edit: Did you try different cables? had similar problems with op2 (not recognizing) with xiaomi cable...
Edit2: to make sure the device is completely dead, use a linux distro (e.g. Ubuntu, ensures that there are no driver problems, you can install it on a usb drive) and a cable which surely works (try it on at least 2 other phones, if data transfer works its ok) then first install fastboot (ctrl+t to open a terminal) by copy/pasting "sudo apt-get install android-tools-adb android-tools-fastboot". Afterwards hold vol- and power button for at least 12secs and plug mi4c in (release the buttons after plugging it in). Now you can run "sudo fastboot devices" and see if there is sth listed (should even recognize it in edl).
Click to expand...
Click to collapse
Did it work?? Any information would be appreciated, so the next one with this problem doesn't have to open a new thread.... @colb16

Apologies for not updating, I got an answer on MIUI official forum from a very helpful member called Codex. Below are steps he asked me to follow and although it took a few attempts my phone came back to life after following below and then pressing power and volume down for numerous minutes.
18:29, Sep-05-2017 | From PC |
Download ROM flashing Tool http://en.miui.com/a-234.html
Then download fastboot rom, if you don't have previously downloaded one. http://en.miui.com/a-234.html
extract the fastboot ROM
Select extract location in flashing tool
connect your phone
refresh
select SAVE USER DATA
flash

Bricked and Boot Loop

Hi all. Looking for some ideas. I think I have ruined my P6X. Model is BLN-L24 and I did the Chinese HWOTA to EMUI 8.0. I then flashed Open Kirin LOS beta 4 and got Oreo up and running! The microphone and speaker didn't work however, so I decided to roll back to the stock system. So via the Update folder method on the sdcard I rolled back first and then reinstalled the original BLN-L24 firmware available on the Huawei website. The phone kept bootlooping and I could not get into eRecovery to factory reset. I then attempted to install TWRP but since the bootloader was relocked I could not do this...so I recalled the saved unlock code I had for this device and did a Fastboot OEM unlock. Now the device simply bootloops no matter what I try to do! It opens with the Honor splash screen, goes into the device cannot be trusted screen warning vibrates twice and bootloops. I can't get into fastboot, I can't get into the sdcard firmware flash update and I can't get into any recovery. The phone will not stay on long enough to be recognized by the computer as it continuously bootloops. Huawei MT version 8 does not recognize the device as being connected and I am now at a complete loss as to what to try...looking for any advice or secret power up + vol key combo to get the phone into either firmware update to reflash via sd card or get the phone into fastboot mode so I can connect to Huawei MT.

Remove backcover and remove battery connector from board and then keep pressing vol- and connect usb to go to fastboot without connecting battery. And unbrick via multitool.

Thanks I'll try and report back!

ratnesh1992 said:
Remove backcover and remove battery connector from board and then keep pressing vol- and connect usb to go to fastboot without connecting battery. And unbrick via multitool.
Click to expand...
Click to collapse
Ok I opened the rear and disconnected battery. It still is doing the same activity while I try to put the device into fastboot

No need to
taemta3 said:
Ok I opened the rear and disconnected battery. It still is doing the same activity while I try to put the device into fastboot
Click to expand...
Click to collapse
i faced the same problem a while ago. my way to solve it was to completly uncharge the phone (let it on or looping till your battery is dead) and connect it with vol- to your pc. for me this helped and bootloader came up again.

Ok I powered down completely, and then reconnect USB w vol down and the phone did the same behavior. I think the motherboard will need some sort of test point to reset to fastboot. It's past my ability. RIP honor 6x

Hard brick without fastboot enabled

Hello guys.
I need your help. My phone bricked itself. I left it on charge for the night and faced a black screen issue next day. Bootloader is not unlocked, so I can't enter the fastboot mode. When I press and hold all three buttons I see Mi logo for some time and nothing after. When I connect it to PC via usb it connects after some time but almost instantly disconnects. During that short period of connected state I see usb serial device(COM7) in device manager which disappears then. Then 20-40 sec pause and the same connection and disconnection. Of cource, miflash doesn't see it at all when I try to flash it. I have no experience with disassembling so I cannot flash the phone using motherboard directly or try to enter fastboot by pulling out and in battery. Any thoughts what it can be and how to fix it? Appreciate any helpful info related. I saw a bunch of articles and cases but everything got stuck because of that frequent usb toggling. Not much you can do when you can't even connect

T_Hladiuk said:
Hello guys.
I need your help. My phone bricked itself. I left it on charge for the night and faced a black screen issue next day. Fastboot is not enabled. When I press and hold all three buttons I see Mi logo for some time and nothing after. When I connect it to PC via usb it connects after some time but almost instantly disconnects. During that short period of connected state I see usb serial device(COM7) in device manager which disappears then. Then 20-40 sec pause and the same connection and disconnection. Of cource, miflash doesn't see it at all when I try to flash it. Fastboot isn't enabled for sure because I cannot enter that mode. I have no experience with disassembling so I cannot flash the phone using motherboard directly or try to enter fastboot by pulling out and in battery. Any thoughts what it can be and how to fix it? Appreciate any helpful info related. I saw a bunch of articles and cases but everything got stuck because of that frequent usb toggling. Not much you can do when you can't even connect
Click to expand...
Click to collapse
Excuse me, but, there are a lot of errors and misunderstanding in your post, so you should need to sort them out, to can advance on this.
Fastboot doesn't need to be enabled, fastboot is always there, you just need to press the right buttons to send it to this mode.
USB debugging enables the ADB connection, most probably, you don't need it to fix your device.
Although this said, keep in mind that your device must have the bootloader unlocked, in order to use fastboot to flash.
If this is not the case, then you should need to use a different mode, the EDL mode, also called QHUSB-9008.
You can try, firstly, by booting in stock recovery, formatting data, sometimes this may fix the bootloop issue.

SubwayChamp said:
Excuse me, but, there are a lot of errors and misunderstanding in your post, so you should need to sort them out, to can advance on this.
Fastboot doesn't need to be enabled, fastboot is always there, you just need to press the right buttons to send it to this mode.
USB debugging enables the ADB connection, most probably, you don't need it to fix your device.
Although this said, keep in mind that your device must have the bootloader unlocked, in order to use fastboot to flash.
If this is not the case, then you should need to use a different mode, the EDL mode, also called QHUSB-9008.
You can try, firstly, by booting in stock recovery, formatting data, sometimes this may fix the bootloop issue.
Click to expand...
Click to collapse
Sorry, you are right. I am not good at firmware and all the related stuff. I've updated the post. I was confused about 'fastboot' and 'bootloader'. I meant bootloader was not unlocked. But about EDL - Redmi 6 has MediaTek SoC, but still it has something similar to EDL mode. Anyway, you showed me what I can try to do next. I will try to use preloader like here https://forum.xda-developers.com/t/...icked-redmi-note-9-merlin-hard-brick.4347025/
Thanks a lot!

T_Hladiuk said:
Sorry, you are right. I am not good at firmware and all the related stuff. I've updated the post. I was confused about 'fastboot' and 'bootloader'. I meant bootloader was not unlocked. But about EDL - Redmi 6 has MediaTek SoC, but still it has something similar to EDL mode. Anyway, you showed me what I can try to do next. I will try to use preloader like here https://forum.xda-developers.com/t/...icked-redmi-note-9-merlin-hard-brick.4347025/
Thanks a lot!
Click to expand...
Click to collapse
Ok, I didn't check exactly the processor on Redmi 6, due to lack of time. Anyway, a MediaTek device is even easier to fix (in the paper). Qualcomm's devices have EDL (Emergency DownLoad) mode, and MTK has Download mode (apart from many more modes.)
You also, can follow this guide, with more visual insights https://forum.xda-developers.com/t/...india-6s-using-spflash-tool-for-free.4222027/ of course replace carefully the files from the ones that are for your device.
And this tool also can be useful, to take a complete backup, after to try a thing https://github.com/bkerler/mtkclient
Be advised, that, in any case you have to make a complete format, in SPFT only use the Download option.
Just as a side note, even your bootloader is locked, you always can enter to fastboot mode, the case is that is almost useless, specially in this situation, because a Xiaomi locked device can't be flashed through fastboot.
And to enter to fastboot mode, it's not the three buttons, you have within the various options, as ADB and commands are not available, you can enter manually, either, pressing the volume minus + PWR at same time, or pressing the volume minus button, at same time you connect your device to your PC.

Question Samsung A12 (SM-A125U) can't flash stock ROM or enter "Downloading mode"

Hi,
I am trying to flash the stock ROM to my phone (worth noting that this is an AT&T phone). For whatever reason I cannot access this "Downloading mode" by pressing the volume up and down buttons at the same time and then plugging in the power cable (the cable is plugged into my computer, not the power block, if that makes a difference); it just shows me the charging symbol and does nothing. I have read many places that in order to use Odin I have to get into this mode; so this isn't working, and I got as far as downloading Odin and putting the proper files in the designated fields.
When I try to access the phone in recovery via adb and fastboot, adb will show the device in the device list, but fastboot won't. Why?
I don't know why these phones don't allow for flashing the OS through the SD card, but that isn't an option either.
I can't do anything from here that I know of. What's my recourse?

IHeartWhitePeople said:
Hi,
I am trying to flash the stock ROM to my phone (worth noting that this is an AT&T phone). For whatever reason I cannot access this "Downloading mode" by pressing the volume up and down buttons at the same time and then plugging in the power cable (the cable is plugged into my computer, not the power block, if that makes a difference); it just shows me the charging symbol and does nothing. I have read many places that in order to use Odin I have to get into this mode; so this isn't working, and I got as far as downloading Odin and putting the proper files in the designated fields.
When I try to access the phone in recovery via adb and fastboot, adb will show the device in the device list, but fastboot won't. Why?
I don't know why these phones don't allow for flashing the OS through the SD card, but that isn't an option either.
I can't do anything from here that I know of. What's my recourse?
Click to expand...
Click to collapse
you have to press vol up + down and plug in cable after that.

TheWorldYT said:
you have to press vol up + down and plug in cable after that.
Click to expand...
Click to collapse
I mentioned in the OP that I tried that. I still cannot get into the downloading mode. The guy at the cell phone repair shop claims to be able to reset the phone though. Does he have special info from Samsung?

IHeartWhitePeople said:
I mentioned in the OP that I tried that. I still cannot get into the downloading mode. The guy at the cell phone repair shop claims to be able to reset the phone though. Does he have special info from Samsung?
Click to expand...
Click to collapse
Nope, it's just that your cable or something is probably broken, or something else is going on, try another cable, maybe?

Hey if u were able to boot into recovery did u try Reboot into bootloader option ?

IHeartWhitePeople said:
Hi,
I am trying to flash the stock ROM to my phone (worth noting that this is an AT&T phone). For whatever reason I cannot access this "Downloading mode" by pressing the volume up and down buttons at the same time and then plugging in the power cable (the cable is plugged into my computer, not the power block, if that makes a difference); it just shows me the charging symbol and does nothing. I have read many places that in order to use Odin I have to get into this mode; so this isn't working, and I got as far as downloading Odin and putting the proper files in the designated fields.
When I try to access the phone in recovery via adb and fastboot, adb will show the device in the device list, but fastboot won't. Why?
I don't know why these phones don't allow for flashing the OS through the SD card, but that isn't an option either.
I can't do anything from here that I know of. What's my recourse?
Click to expand...
Click to collapse
power the device off n hold volume down while pluuging in type c usb cable pc required!!!!!!!!! OLLERKY100

Did you turn on OEM unlocking