No OS ,how do I boot into bootloader - General Questions and Answers

hello guys,,i dont have my os and i only have normal recovery of lenovo vibe shot ,,i want to access bootloader so that i can flash twrp recovery so that i can install new rom,,,but when i try to access boot loader using adb tools in pc it shows
"c:\program files <x86>\Minimal ADB and Fastboot> adb reboot bootloader
error: device unauthorized.
This adb server's $ADB_VENDOR_KEYS is not set
try 'adb kill-server' if that seems wrong.
Otherwise chech for a confirmation dialog on your device""""
but i dont have os installed and i want to flash New rom by flashing twrp or qcomdloader and qcimdloader does not recognize my phone ,
plzz someone help

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Fastboot Commands Don't Work

I am trying to unroot and re-lock my xoom and everytime I try to use a fastboot command all I get at the command promt is "waiting for device". I have installed the moto drivers and adb is working fine, just no fastboot. Please help... Thanks in advance!
did you reboot your xoom into bootloader mode? (adb reboot bootloader)
does it show any devices when you type
adb devices
Yes,
adb devices returns the attached device with the serial number.
adb reboot bootloader reboots the device and it say starting fastboot protocol at the top. then when I try to use fastboot flash boot boot.img or any other fastboot command all it does is say waiting for device and that's it..
usb debugging is on? should be if you see the device with adb devices
try to flash another cwm - like rogue version
if you do that - same error?
./adb reboot bootloader
./fastboot flash recovery recoveryroguecwm.img (change real filename )
well, usb-debugging has no effect whatsoever on fastboot.
personally, I suspect a problem outside of the xoom. Have you installed the current motorola drivers using driverhelper? If not, please do so. Please make sure any firewall or anti-virus-software on your computer is disabled or uninstalled.
If you have the possibility, you should try fastboot with another computer.
btw: I'd try if fastboot works with the command fastboot devices. This should return a list of connected and detected devices.
Thanks! For some odd reason my driver needed to be re=installed. After I did that a restarted my computer everything works as it hasin the past!

Micromax A110 Bricked Need HELP! :,(

I just Got my New Phone and I got this Build.prop file edited by mistake and then when i reboot i got the screen hang logo :,( so called Bootloop i tried connecting to my Pc but My pc didnt detect it not even a PoP! Sound comes i can access Stock Recovery only (default recovery) is there a way i can recover it please help me developers :crying::crying::crying::crying:
There are 2 methods both will wipe your app data either
1 flash a custom recovery via fastboot method and then custom rom
2 if you dont want custom rom and want stock rom then download the stock rom zip and flash via sp flash tools
How i am gonna flash my phone is not connecting to pc :/
P.S My device manager also dont show my device
I am assuming you can get into fastboot mode
1 download twrp/cwm or any recovery
2 go into cmd (assuming you have adb) type "fastboot devices" and a device would show up
3 next "fastboot flash recovery recovery.img"
4 "fastboot reboot" and enter recovery
5 now flash the stock rom zip if you dont have downloaded then download it before in your memory card
6 if by any chance you are unable to use memory card then while in recovery connect your phone to pc and type "adb devices" then "adb sideload rom.zip"
if you dont have adb download it
there is another method still if you have problem PM me
lurk1n in shad0ws said:
I am assuming you can get into fastboot mode
1 download twrp/cwm or any recovery
2 go into cmd (assuming you have adb) type "fastboot devices" and a device would show up
3 next "fastboot flash recovery recovery.img"
4 "fastboot reboot" and enter recovery
5 now flash the stock rom zip if you dont have downloaded then download it before in your memory card
6 if by any chance you are unable to use memory card then while in recovery connect your phone to pc and type "adb devices" then "adb sideload rom.zip"
if you dont have adb download it
there is another method still if you have problem PM me
Click to expand...
Click to collapse
Well i tried that but my Device cant connect to PC (adb devices cant event show my phone) Device manager is also not showing it :/ Help me please
i can go in fastboot but my pc cant detect it not even give a Ping! sound

how to fix error "waiting for device" for install twrp in cmd?(GT-I9105)

Hi,I want install custom recovery twrp in my device.i install driver on PC,turn on usb debugging,go device in bootloader mod,and my bootloader deafult unlock(because model of my device is old and it's unlock deafult) and my device is ROOT.when i download my last version of twrp and open it with cmd and write "fastboot flash recovery name.img" cmd say "wating for device" and not do anythings at all,and don't go too next stap.what i must to do?(i can open folder of my device on PC)(win 8.1)
Why don't you flash it with odin?

Phone can't enter bootloader

Hello.
I have bricked my phone(I edited build.prop). Now it can only enter recovery mode. I can access the phone by using adb, but I can't get root access in shell(but my phone is rooted), it just says connection to ui timed out, so I can't replace build.prop. I wanted to flash custom recovery on my phone, but when I reboot in bootloader mode using adb, phone just stuck at the logo(and when I tried to reboot in fastboot mode, the same thing happened, but at this time logo just disappeared after some time). After trying to enter fastboot or bootloader adb don't see the device. I have installed all drivers, enabled usb debugging(just in case), Phone model is Micromax Canvas Elanza 2(or Micromax Canvas A121).
So, my questions are:
How can I get root access in adb shell?
How can I load my phone in bootloader/fastboot?
And is there any another way to unbrick this device?
P.S. Sorry for my English and thanks in advance.
from recovery mode there should be a option "reboot to bootlader" this will bring you in download mode. while in download mode install the drivers (these are different from adb devices) and make sure "fastboot devices" does recognize the phone. now you can boot into custom recovery without flashing it "fastboot boot recovery.img". once in custom recovery again install drivers and then check "adb devices" while in custom recovery. "adb shell" will give you root access while in custom recovery

download mode - device not seen in adb or fastboot

Hi
I did terrible mistake when updating to LineageOS 18.1. Just after flashing, it asked me if I want to switch TWRP 3.4 to LineageOS recovery, and I clicked yes... Now OS is not starting, phone is booting to LineageOS recovery instead. Error log is filled with
"failed to mount /cache: no such file or directory".
This recovery lacks of option to flash using img or zip, there is only "adb sideload" option. Problem is, that phone is not discoverable via adb anymore.
But putting LineageOS recovery away, fourtunately I can boot phone into download mode. It appears in device manager (I am using windows 10), but correct driver can not be found. In consequence, "adb devices" or "fastboot devices" shows nothing. Do you know, if there is an option to install windows 10 driver for u11 and flash TWRP again ?
I would appriciate any help
In case of anyone having similar issue as me, I was able to solve it using @Aldo101t link. Thanks!
Fastboot Not Recognizing My U11
Trying to unlock the bootloader on my HTC U11, but fastboot isn't recognizing the device (fastboot devices returns no serial number and fastboot oem get_identifier_token doesn't work) I have tried Minimal ADB and Fastboot, ADB and Fastboot...
forum.xda-developers.com
orestlenczyk said:
In case of anyone having similar issue as me, I was able to solve it using @Aldo101t link. Thanks!
Fastboot Not Recognizing My U11
Trying to unlock the bootloader on my HTC U11, but fastboot isn't recognizing the device (fastboot devices returns no serial number and fastboot oem get_identifier_token doesn't work) I have tried Minimal ADB and Fastboot, ADB and Fastboot...
forum.xda-developers.com
i am having the same issue, how did you flash twrp again? No matter what i do, I can't replace LOS recovery
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