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[Q] How to check bootloader?

Hi,
I'm new to Android. I'm checking out the CyanogenMod guide and it says:
If the Bootloader on the Nexus S has already been unlocked, you may skip this section.
.. how do I check if my nexus comes unlocked or not?
Thanks

Power off the phone hold and continue to hold the volume up button and press the power button. Use the volume keys to toggle down till recovery lights green. Press power buttom. If you see the custom recovery titled: Clockworkmod then it has been unlocked. Or the other method to bypass this has been done.
Or more simply if you are the first owner of the device and are new to android you don't have a unlocked bootloader because you have not done the precess needed to root the device.

jerrycycle said:
Power off the phone hold and continue to hold the volume up button and press the power button. Use the volume keys to toggle down till recovery lights green. Press power buttom. If you see the custom recovery titled: Clockworkmod then it has been unlocked. Or the other method to bypass this has been done.
Or more simply if you are the first owner of the device and are new to android you don't have a unlocked bootloader because you have not done the precess needed to root the device.
Click to expand...
Click to collapse
Ummm your bootloader can be unlocked without changing recovery.
Just turn the phone off. Hold volume up and power, this will get you into bootloader mode.
Look for lock state. It'll say either unlocked or locked.
If its unlocked, you'll see a lock under Google upon turning the phone on
Sent from my Nexus S using XDA Premium App

I suppose someone should add that unlocking the bootloader while simple enough in comparison to other devices, will erase the internal SD of the phone so make a backup if you have anything you don't want to lose

It is possible to root the nexus s without unlocking the bootloader thus not losing data. I did the oem unlock on one device and the non oem unlock on another. There is a thread for it in the sticky.

[Q] HTC One S - Cannot get into Bootloader

I have searched the forum but no luck on this one.
When I Press Power and Down Vol HTC One S just reboots - it does not go into Bootloader menu.
I cant take the battery out as suggested elsewhere because battery is non-removable.
Fast Boot is Off in the Power Menu.
Any suggestions ?

zobojoe said:
I have searched the forum but no luck on this one.
When I Press Power and Down Vol HTC One S just reboots - it does not go into Bootloader menu.
I cant take the battery out as suggested elsewhere because battery is non-removable.
Fast Boot is Off in the Power Menu.
Any suggestions ?
Click to expand...
Click to collapse
Go to terminal Emulator and type "su" and then "reboot download".

Thanks for this.
I'm not rooted so I cant do su in Terminal Emulator
Can I do ...
adb reboot download
from Mac instead ?
Can you explain what this does ?

zobojoe said:
Thanks for this.
I'm not rooted so I cant do su in Terminal Emulator
Can I do ...
adb reboot download
from Mac instead ?
Can you explain what this does ?
Click to expand...
Click to collapse
Hi,
maybe you can use the ADB to get in the bootloader.
just look onto this HERE
the text there is english because i've only the german explaining and so i don' need to translate it.

EDIT: Finally got into bootloader by connecting phone to a PC with USB Debugging enabled and entering "adb reboot bootloader" in console.
Hi zobojoe, any luck with getting to the bootloader? I have HTC One S imported from Germany with T-Mobile branding and I want to get rid of that branding by flashing the stock ROM but can't get in to the bootloader same as you. What version of phone do you have?

Hi guys i've search the xda maybe this could help you to get the debranding off and get root acess on the phone i don't testing it because i've only the HTC sensation
TUT
Hope i can help you

dagger780 said:
Hi guys i've search the xda maybe this could help you to get the debranding off and get root acess on the phone i don't testing it because i've only the HTC sensation
TUT
Hope i can help you
Click to expand...
Click to collapse
Hey, thank's for trying to help! I've seen the thread you posted before - used it to get CWM and root but I've spent last 3 hours trying to get the stock ROM in my phone (I really hate the T-mobile branding) and nothing worked. What I did was I downloaded RUU_Ville_U_HTC_Europe_1.53.401.2_Radio_0.15.31501 S.19_10.12.31501S.06L_release_251412_signed.exe and tried to flash that using RUU. It didn't let me. So I at least got the zip file from the exe (temp method) and tried to flash that in CWM but id didn't work either (probably because it was not signed). So I tried to extract the system.img and radio.img and pack it again in a new zip and sign it myself - didn't work either. Kinda stuck now. Help from someone familiar with packing ROMs would be highly appreciated. I can't be the only one trying to debrand my phone .

Maybe the bootloader is Not unlocked?
Sent from my Sensation using XDA

dagger780 said:
Maybe the bootloader is Not unlocked?
Sent from my Sensation using XDA
Click to expand...
Click to collapse
Yes it it. Before I unlocked it, the RUU update ended with error 170. After unlocking it RUU update started kinda flashing something, but then ended with black screen with HTC logo and then turned into RUU fail! red warning.

Hi Andrew SM
I too have been able to adb reboot into bootloader but can't understand why power + vol down just reboots the phone and not go into bootloader as it should ?
Is it the case that it is rebooting straight into recovery mode when I do power + vol down and then just boots ? - what should I normally expect to see when I boot into recovery mode ?

zobojoe said:
Hi Andrew SM
I too have been able to adb reboot into bootloader but can't understand why power + vol down just reboots the phone and not go into bootloader as it should ?
Is it the case that it is rebooting straight into recovery mode when I do power + vol down and then just boots ? - what should I normally expect to see when I boot into recovery mode ?
Click to expand...
Click to collapse
I don't think it is recovery - you would se a black screen with a phone icon in the midddle of it with stock recovery.
But I was able to get to bootloader with VOL DOWN + POWER finally after unlocking bootloader via htcdev.com (bootloader screen starts showing *** TAMPERED *** on the top, but that is normal). And you have to disable Fast boot in Settings -> Power of course.
Good luck!

Boot loader
Little late to the party, but I've found the best way to get into boot loader wiht any consistency is to hold the volume down and power button for five seconds or so, then let go of the power button (while holding volume down), then tapping the power button. Boot loader should pop up
Hope this helps!

Brilliant! Worked perfectly! Thanks very much.

no99sqrd said:
Little late to the party, but I've found the best way to get into boot loader wiht any consistency is to hold the volume down and power button for five seconds or so, then let go of the power button (while holding volume down), then tapping the power button. Boot loader should pop up
Hope this helps!
Click to expand...
Click to collapse
BOOM this saved the day, thANKS!!

no99sqrd said:
Little late to the party, but I've found the best way to get into boot loader wiht any consistency is to hold the volume down and power button for five seconds or so, then let go of the power button (while holding volume down), then tapping the power button. Boot loader should pop up
Hope this helps!
Click to expand...
Click to collapse
Thanks for this!
Was right before going into rage-mode. But luckily I found your post.

AndrewSM said:
EDIT: Finally got into bootloader by connecting phone to a PC with USB Debugging enabled and entering "adb reboot bootloader" in console.
Hi zobojoe, any luck with getting to the bootloader? I have HTC One S imported from Germany with T-Mobile branding and I want to get rid of that branding by flashing the stock ROM but can't get in to the bootloader same as you. What version of phone do you have?
Click to expand...
Click to collapse
I cannot enter the bootloader too, so I have follow your instruction and now I can enter inside bootloader. I was wondering why this was necessary.
Anyway I just have the massage : locked and NOT the TAMPERED advice.
Anyway I will wait to unlock my one s, I wanna see if a different unlock way from htcdev cames out because I do not wannt risk that the warranty could be void. Have anyone tried this: http://forum.xda-developers.com/showthread.php?t=1578908 ?

Thanks a lot for this trick! This works immediatly!

Another easy way to get into boot loader every time is :
1. power off phone
2. hold the volume down button ( until boot menu open )
3. press power button for about 2-3 seconds then let go

new developer need 10 posts in general discussion sry

[Q] Unlocked phone, now I can't boot into bootloader

I was trying to root one of my One x's and got to the unlocked with x-factor, got the phone unlocked. Had an emergency and had to stop at that point. Now I can't boot back into bootloader. Can any one tell what I need to do to get back to the point where i was at so I can finish rooting. Thank you for any help that is given.

Where excactly in the process did you stop? Have you flashed recovery?
Sent from my HTC One X using xda app-developers app
---------- Post added at 09:25 AM ---------- Previous post was at 09:15 AM ----------
You can manually enter bootloader by holding volume down and power at the same time. When lights stop flashing, release power while continuing to hold volume down. It will go into bootloader.
Sent from my HTC One X using xda app-developers app

scrappy1959 said:
I was trying to root one of my One x's and got to the unlocked with x-factor, got the phone unlocked. Had an emergency and had to stop at that point. Now I can't boot back into bootloader. Can any one tell what I need to do to get back to the point where i was at so I can finish rooting. Thank you for any help that is given.
Click to expand...
Click to collapse
You stopped mid unlock? What was the last step you completed?
Sent from my One X using xda app-developers app

I got to flash a recovery on the Hasoon2000's HTC One X All-in-One Kit, now when I try to boot up I get the HTC screen with red writing (warning about legal action) and then a black screen and when I plug in the USB and the PC says installing device drivers, it says device driver not successfully installed, that's as far as I can get. Tried to get into bootloader on the Hansoon app and the command prompt says device not found.

scrappy1959 said:
I got to flash a recovery on the Hasoon2000's HTC One X All-in-One Kit, now when I try to boot up I get the HTC screen with red writing (warning about legal action) and then a black screen and when I plug in the USB and the PC says installing device drivers, it says device driver not successfully installed, that's as far as I can get. Tried to get into bootloader on the Hansoon app and the command prompt says device not found.
Click to expand...
Click to collapse
Yes it will say device not found because you're not in fastboot or booted into rom with USB debugging on. You need to manually boot to the bootloader.
If your phone is on. Press and hold power. The back home and app switch keys on the bottom of the phone will blink 5 times, the screen will go black. Let go of power and wait 2-3 seconds, then, BEFORE the screen turns back on, press and hold power and volume down until the bootloader comes on
If your phone is off just press and hold volume down and power until it boots into bootloader.
You may have trouble while your phone is plugged in so best to do this with it unplugged.
* On a side note, If you haven't read enough to know how to get into the bootloader you should REALLY not be messing around with your phone.

[q] [help]nexus 5 stuck. 5.0.1. Stuck while booting.

Hey there,
I am Nexus 5 user. Recently I updated my phone to Lolipop 5.0.1. At first the phone worked fine. A few days later the background apps started restarting. That was still manageable. A week back the phone started restarting. So I read about in a Google Forum, it advised to delete partition cache from the 'Recovery Mode' . I did so. It worked and phone stopped restarting. Now a week later the problem started again. So I wiped partition cache. But during the process the battery ran out and the phone switched off.
Now when I try to switch on the phone, the Google logo appears and then the phone freezes in the boot animation.
The phone boots into bootloader(power button + volume up + volume down), but when I try to get into Recovery Mode, an android is displayed with a red exclamation mark.
The bootloader is locked, so I can't flash the original image.
Need help to get the phone back.
Additional info about the device:
a. Nexus 5 32GB
b. Lolipop 5.0.1
c. Locked bootloader/ unrooted
d. Still in warranty.

The dead android is recovery mode. When you see that press and hold the power button then press and release vol up. Try a factory reset in there. Note, it will wipe your device so backup first if you can.
Sent from my Nexus 5 using XDA Free mobile app

jd1639 said:
The dead android is recovery mode. When you see that press and hold the power button then press and release vol up. Try a factory reset in there. Note, it will wipe your device so backup first if you can.
Sent from my Nexus 5 using XDA Free mobile app
Click to expand...
Click to collapse
This isnt't working. Holding the power button and volume button together does nothing. Holding only the power button puts the phone back in boot loop. Any other suggestions?

ShobhitJethani said:
This isnt't working. Holding the power button and volume button together does nothing. Holding only the power button puts the phone back in boot loop. Any other suggestions?
Click to expand...
Click to collapse
I think you're going to have to unlock the bootloader and flash the factory image. If that doesn't work then you have a hardware issue.
Sent from my Nexus 9 using XDA Free mobile app

jd1639 said:
I think you're going to have to unlock the bootloader and flash the factory image. If that doesn't work then you have a hardware issue.
Sent from my Nexus 9 using XDA Free mobile app
Click to expand...
Click to collapse
The phone isn't turning on. Any way I can unlock the bootloader without turning it on? Also, USB debugging is also turned off.

ShobhitJethani said:
The phone isn't turning on. Any way I can unlock the bootloader without turning it on? Also, USB debugging is also turned off.
Click to expand...
Click to collapse
If it doesn't turn on there is nothing you can do. You need to be able to boot into the bootloader. Usb debugging doesn't matter. You don't need it on to run fastboot commands.
Sent from my Nexus 9 using XDA Free mobile app

jd1639 said:
If it doesn't turn on there is nothing you can do. You need to be able to boot into the bootloader. Usb debugging doesn't matter. You don't need it on to run fastboot commands.
Sent from my Nexus 9 using XDA Free mobile app
Click to expand...
Click to collapse
The phone turns on. But goes into boot loop. I can boot into bootloader. But the bootloader is locked. How do I unlock it?

ShobhitJethani said:
The phone turns on. But goes into boot loop. I can boot into bootloader. But the bootloader is locked. How do I unlock it?
Click to expand...
Click to collapse
Google 15 second adb install xda. That'll setup adb and fastboot on your pc. Then boot the device into the bootloader, open a command window on your pc and then with your device connected via usb cable type into the command window
fastboot oem unlock
See this, http://forum.xda-developers.com/showthread.php?p=47156064
Sent from my Nexus 9 using XDA Free mobile app

jd1639 said:
Google 15 second adb install xda. That'll setup adb and fastboot on your pc. Then boot the device into the bootloader, open a command window on your pc and then with your device connected via usb cable type into the command window
fastboot oem unlock
See this, http://forum.xda-developers.com/showthread.php?p=47156064
Sent from my Nexus 9 using XDA Free mobile app
Click to expand...
Click to collapse
Thanks for the link, but the link says to unlock the bootloader, for that I need the phone to get pass the boot animation. Which is the main problem.

ShobhitJethani said:
Thanks for the link, but the link says to unlock the bootloader, for that I need the phone to get pass the boot animation. Which is the main problem.
Click to expand...
Click to collapse
Will the device boot into the bootloader, press and hold power and vol down? If it does you can unlock it and flash the factory image
Sent from my Nexus 9 using XDA Free mobile app

jd1639 said:
Will the device boot into the bootloader, press and hold power and vol down? If it does you can unlock it and flash the factory image
Sent from my Nexus 9 using XDA Free mobile app
Click to expand...
Click to collapse
The device does boot into bootloader. But when I get into recovery mode, an android with red triangle and exclamation is displayed. How do I remove it and get back into the normal recovery mode?

ShobhitJethani said:
The device does boot into bootloader. But when I get into recovery mode, an android with red triangle and exclamation is displayed. How do I remove it and get back into the normal recovery mode?
Click to expand...
Click to collapse
You don't need to get into recovery. Boot into the bootloader, unlock it, then flash the factory image. All that is done in the bootloader, not recovery.
Sent from my Nexus 9 using XDA Free mobile app

There is little confusion here @ShobhitJethani. Let's make things clear.
Bootloader mode (or fastboot mode) is when you press and hold volume_down+power keys.
Recovery mode is when you select the recovery mode with the power key in the bootloader mode.
To enable the menu options in stock recovery you have to PRESS and HOLD the POWER key and while you do that you just PRESS the VOLUME_UP key and then you RELEASE the VOLUME_UP key and then you can RELEASE the POWER key too.
What you did is starting to press and hold volume _up and power keys at the same time which is wrong.
Also, to unlock bootloader you just have to put the phone to bootloader mode. You dont have to do anything special before that.
I hope you now understand.

I somehow managed to remove the tamper flag and then gave it to the service center. They flashed KitKat on the phone. And now I also have updated my phone to 5.1 OTA. Thanks to everyone for trying to help me.

Cannot unlock bootloader

Hi I'm hoping someone can help or at least point me in the right direction if i've missed a thread, i'm on Windows 7 64bit.
I appear to be stuck in a boot loop on my original Shield Tablet, stuck on nvidia screen when i try to go into recovery mode i get the "dead android" picture.
I have tried to unlock the bootloader and i get FAILED <remote: <>, device shows up under fastboot devices command, device shows up as Android Bootloader Interface in Device Manager.
I've searched the forums and seen this problem but everyone else seems to be able to unlock easily, this is the same but no replies https://forum.xda-developers.com/shield-tablet/help/nvidia-shield-unlock-bootloader-failed-t3178865.
Any help anyone can give me would be appreciated. Thanks in advance.

Check the recovery images section for your device here: https://developer.nvidia.com/shield-open-source
Instructions to unlock the bootloader:
Unlocking the Bootloader
Your SHIELD TABLET may have shipped with a locked bootloader. To update the device,
you must unlock the bootloader using the following:
- fastboot oem unlock
- Press the "Volume Down" button to select "Unlock bootloader" option on device
- Press the "Power" button to confirm the unlock. Your device's bootloader is now unlocked.
Click to expand...
Click to collapse
You need to already have adb set up and the Shield connected to the PC to do this. If you don't have USB debugging enabled, this may not be possible, but you should still be able to get into recovery by booting the tablet with Vol- and power button (hold volume - and then just press the power button, don't hold both at the same time).

Yes I've tried that (I know the steps of unlocking the bootloader) that's when i get the FAILED error. When I try to enter recovery I get the "dead" Android picture.