Questions tagged [bootloader-lock]

Some bootloaders are locked by the manufactures to prevent the phones from booting unofficial firmware images.

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51
votes
2answers
35k views

Why does unlocking the bootloader wipe phone?

I understand that unlocking the bootloader will wipe my Android phone, but have been looking around for why. Seems to be by design, but what is the reasoning for that design? Is it some security ...
32
votes
1answer
31k views

What's the security implication of having an unlocked boot loader?

Nexus devices can be unlocked using the fastboot command fastboot oem unlock to install a custom firmware. For security reasons, the phone is wiped when this command is executed. However after this is ...
20
votes
4answers
93k views

What does “fastboot oem lock” do?

I've had my phone for months, loading with several firmware, ROMs and OTAs, without ever running this command. What does it do? What I know is that "fastboot oem unlock" displays the confirmation ...
15
votes
3answers
169k views

How to re-lock Android bootloader?

I've unlocked my Nexus 5 by using CF-Auto-Root. I want to undo my actions and return the device to its original state: unrooted and locked. How can I do this?
8
votes
1answer
15k views

fastboot not working on my Nexus 4

I'm trying to root my N4, and fastboot doesn't seem to work. Running it on linux, and the fastboot binary seems to run. 'Fastboot devices' produces info on my device, but 'fastboot oem unlock' just ...
8
votes
2answers
18k views

Nexus 7 Error: Failed to mount /cache

I had a problem with my Nexus 7 (2013, 2nd gen) tablet. I restarted my tablet and when it was rebooting again, it showed "Google" logo and then stood there. I wait it (around 20 minutes) but it did ...
7
votes
3answers
28k views

unlocked device vs. unlocked bootloader

I've always thought that if a device is unlocked it means that it works with different carriers. If the device bootloader is unlocked, then does this mean the device will automatically work with ...
5
votes
2answers
63k views

Unlock bootloader using fastboot using Ubuntu/Linux

I am trying to unlock bootloader for my HTC Legend. I have ADT (Android SDK according to release 21.1) on my Ubuntu/Linux box. While following the HTCDev instructions to unlock bootloader of HTC ...
5
votes
1answer
1k views

Why does unlocking bootloader affect camera quality on some devices?

Sony announced it officially that unlocking bootloader, since it will remove DRM keys, might affect camera quality. For high-end devices running recent software versions, for instance Xperia Z3, ...
5
votes
1answer
7k views

what is a bootloader unlocked phone?

What is a bootloader unlocked phone? How we can make use of it while creating or flashing ROMs? What are advantages of unlocked bootloaders over locked bootloaders? Why does not any OEM generally ...
5
votes
2answers
48k views

Problem unlocking HTC phone using their fastboot program

According to HTC, my Amaze 4G is fully ready from the factory to be queried for its identifier tolken, but when I run the appropriate command, it doesn't work. I get: $ fastboot oem ...
5
votes
1answer
17k views

Problem with unlocking the HTC Wildfire bootloader with HTC unlocker

I tried to unlock HTC bootloader by the official tool but I get to the stage when I issue the command: fastboot oem get_identifier_token Unfortunatly I get error ... (bootloader) [ERR] Command ...
5
votes
1answer
156k views

How to unlock bootloader on samsung devices?

Before you try to install any custom ROM on your device, you need to unlock the phone’s bootloader, which is a code executed before any OS (operating system) launch. The notion of a bootloader is ...
4
votes
1answer
2k views

What exactly gets wiped when unlocking Galaxy Nexus?

I've seen a few guides on how to unlock the Galaxy Nexus to prepare it for rooting, and they say that the fastboot oem unlock command will "wipe your personal data". I'm a little unclear on what gets ...
4
votes
1answer
3k views

Does the Samsung Galaxy S II come with an unlocked bootloader?

Does the Samsung Galaxy S II come with an unlocked bootloader as earlier promised by Samsung?
4
votes
2answers
7k views

How to re-unlock bootloader for OnePlus One

I have OnePlus One with CyanogenMod 12 from factory and I decided to update to CM 13 (nightly build). To achieve this I did the following from OSX: Unlock the bootloader (fastboot oem unlock) Boot ...
4
votes
2answers
493 views

Android Nexus 6 Bricked? TeamWin splash screen turns on and off

I think I've bricked my Nexus 6. Every time I turn it on, the teamwin (TWRP) splash screen keeps literally flashing on and off. I would be able to flash a stock system on but I can't due to the fact ...
3
votes
1answer
1k views

What is the point of a locked bootloader if a deep flash cable can bypass it?

I was reading about how important is locked bootloaders for users security after Xiaomi decided to lock some bootloaders of its phones. 1 However, I found that there is a specially engineered cable ...
3
votes
1answer
1k views

Does the bootloader need to be unlocked to flash my phone

I am not able to relate between bootloader unlocking and flashing. From what I understand, when I flash my phone with a custom ROM, it writes to the /boot partition and hence the bootloader has to be ...
3
votes
1answer
2k views

Does Unlocking bootloader affect network lock?

Will the bootloader unlock procedure as shown on the HTC Dev website affect my network lock? I have an HTC Aria, which was originally SIM locked, but I got unlocked from a shop. Now, since I'm ...
3
votes
2answers
2k views

How to unlock Nexus S 2.3.3 bootloader without having to wipe all device data?

The usual way is to execute: fastboot oem unlock But this will erase all my private data.
3
votes
1answer
3k views

Xperia play bootloader locked?

Hi guys i've been trying for quite a while to unlock the bootloader of the phone i've bought. It's from hong kong and branded to vodafone it's not sim locked as I tried an optus sim and it worked. I ...
3
votes
1answer
495 views

Moto E (1st Gen) Bootloader Unlocking

There was some problem with my 1-yr-old Moto E 1st gen. It got dead and after some time the dead android guy appears with some red-blue thing on its chest. It appears for half a second. I pressed ...
2
votes
2answers
1k views

Will bootloader unlocking provide access to all the apps in the Play Store?

My flyer doesn't allow few apps to be installed from the Play Store as it shows "This app is not compatible with your device" and this incompatibility is not due to OS. If I get the apk of this app ...
2
votes
1answer
7k views

Does “fastboot oem lock” prompt to confirm?

I want to run fastboot oem lock (or fastboot flashing lock) on my Oppo Find 7 to see if I can reproduce the behavior in this post. However, I don't actually want to go through with the bootloader ...
2
votes
1answer
637 views

Xperia V can I relock my bootloader for Bravia Engine to work again?

I have unlocked the bootloader to try some roms, but too late I understand that this will make the Bravia Engine to stop working... If I relock my bootloader will that make the Bravia Engine to work ...
2
votes
3answers
13k views

Where can I find my device product ID using ADB shell commands?

I want to unlock my device (Huawei G610-U20) bootloader but I'm unable to retrieve my product ID from common way *#*#1357946#*#* Product ID is required by Huawei website to provide the unlocking ...
2
votes
1answer
6k views

Can I fastboot flash a factory image without flashing the recovery?

Factory Images Using Nexus 9 as an example, the flash-all.bat contains: fastboot flash bootloader bootloader-flounder-3.43.0.0114.img fastboot reboot-bootloader ping -n 5 127.0.0.1 >nul fastboot -...
2
votes
1answer
127 views

actual limitations of locked bootloader

I have read in many posts that a locked bootloader prevents from flashing custom ROMs, because it checks the digital signature of the ROM itself. I thought a "bootloader" was only responsible for ...
2
votes
1answer
9k views

How to check if bootloader is unlocked mediatek device

My Device: Rooted Karbonn A52+ Android 4.2.2 (Stock ROM) | MTK6572 CPU Hi friends, I was recently able to flash Clockwork Mod Custom Recovery followed by a Custom ROM flash from the recovery (though ...
2
votes
2answers
2k views

Can JFLTE Lollipop ROM be installed on the Verizon Galaxy S4 SCH-i545 with ME7 baseband?

I have a rooted Verizon Galaxy S4 SCH-i545 (edit: NOT GT-i9505) updated to the ME7 baseband version. I would like to upgrade to this Lollipop ROM, which appears to be designed for the GT-i9505, but I ...
2
votes
1answer
739 views

Does Sony always check if the bootloader has been unlocked when repairing the phone?

I'd like to unlock my Xperia Neo V's bootloader, but on the other hand I don't want to lose my warranty. Obviously, that isn't possible. So my question is: Do Sony Ericsson's repair centres always ...
2
votes
1answer
270 views

As of vendors - whose bootloaders are easy to unlock, and whose not?

The vendors differ in their attitude to unlocking the bootloader. Some require codes for unlocking, some not. Some require proprietary, Windows-only software, other not. Which of the vendors are ...
2
votes
0answers
15k views

Cannot flash Moto G3 2015 due to “Preflash validation failed” error?

I have a Moto G3 XT1550 phone. I had to reset the phone as its UI was restarting on its own after 1-2 minutes of usage. After the phone booted, it asked me to enter the GMail and password the phone ...
2
votes
0answers
1k views

What dose “Enable OEM Unlock” do, and how can I do it through a root shell?

Looking at this Samsung Galaxy A8 question, I was looking to do something on my nexus 6p. I would like to enable OEM unlocking, the developer setting. Due to the problems my device is experiencing, ...
2
votes
0answers
816 views

Any chance to unbrick relocked HTC One M7 with S-on and a old copy of the RUU.zip

Background After 1 year of use, the most recent OTA to my HTC One rendered several key features, including the notification bar and the home and back buttons, unusable , effectively soft-bricking ...
2
votes
1answer
1k views

Oppo find 7: bootloader re-lock impossible?

I tried to relock the bootloader on my Find 7 (which I'm pretty sure was unlocked since I installed a custom rom). fastboot oem lock ... After that nothing. Windows console is "stuck". Any clue?
2
votes
0answers
450 views

Unlocking bootloader on Sony Ericsson NEO V

Has anybody managed to use Fastboot on Ubuntu to unlock the Sony Ericsson Neo V? I tried and got the blue led light (bootloader) while connecting the USB. But Fastboot still doesn't recognize the ...
1
vote
3answers
7k views

Will a Factory Reset lock my phone (Samsung Galaxy S2) if it is unlocked, but factory locked?

I know that formatting the SD card will not lock my phone again. But if I Factory Reset my phone, will it re-lock the phone or not?
1
vote
2answers
5k views

Unlock Xperia Play R800i for use with CM9

Is there any way I can unlock the bootloader for my O2 Xperia Play so I can install Cyanogen Mod on it? Sony announced today that they will not be releasing ICS for the Xperia Play. Now I want to ...
1
vote
2answers
35k views

Can I flash CyanogenMod without unlocking bootloader?

With a locked bootloader on an SE ST17i running the rooted Stock Xperia Gingerbread 2.3.4, can I flash the CyanogenMod 9 onto it? Or do I really need my bootloader unlocked? I also have ClockWorkMod ...
1
vote
2answers
2k views

On flashing TWRP: Custom binary blocked by FRP Lock

Whenever I try to flash TWRP I get Custom binary blocked by FRP Lock. I'm trying to flash with Heimdall.
1
vote
1answer
6k views

Is it possible to lock the bootloader without losing data?

Is it possible to lock my phone without losing the system data it has? I had previously unlocked my Nexus 6p to get root access, and have since despised the big yellow warning sign reminding me that ...
1
vote
1answer
6k views

How to install Nexus 6 / 5X / 6P Drivers in Windows 7 properly where fastboot can see it?

I have the Nexus 5X drivers installed properly on Win7 64bit and it shows up in my device manager as Nexus 5x. I can verify that it gets detected as I see it in chrome inspect page. But when i try to ...
1
vote
1answer
2k views

Unlocking Bootloader of HTC One X on Windows 8.1 / Linux Ubuntu

How to unlock the bootloader of HTC One X on Windows 8.1? Since I want to install MIUI Rom. When I install the latest version of "HTC Sync Manager", It shows me that the Windows 8.1 is not competible ...
1
vote
5answers
3k views

Is it possible to enable bootloader unlocking on C6603 (Yuga/Sony Xperia Z)?

I was following Sony's official guide for unlocking the bootloader. However, upon entering *#*#7378423#*#* into the phone App and navigating to Service Info -> Configuration under the Rooting ...
1
vote
1answer
2k views

Unlocking the Bootloader on a Nexus One with S-On

I'm interested in rooting my (Very recently bought) nexus one, and installing Cyanogenmod over Fastboot. However, on the boot screen of my device I've noticed the first line tells me that security is ...
1
vote
1answer
59 views

Pattern unlock required when starting phone

AFAIK on Android 7 Nougat, when you set pattern unlock, the user is not required to enter the pattern to power up the phone. However, on Android 8.1 Oreo (I'm running a Wiko VIEW MAX Android 8.1 phone)...
1
vote
1answer
31 views

I Have an LG P769. I am trying to root it and it is not working

Forewarning: I am not exactly an expert on this type of thing. I have tried several things, but the problem seems to be that I cannot get into the bootloader via "adb reboot bootloader" or by ...
1
vote
2answers
504 views

FRP and OEM locks bricked my Samsung phone after root

I recently flashed my SM-J701F (Samsung Galaxy J7 Nxt, Android 8.1) with TWRP and Magisk. Both OEM and RFP locks somehow turned themselves on when I tried to reboot, effectively bricking it by ...