Develop Bugs

Bootloader HELP

Hi.
Recently I was interested in making a root for my device- LG G4 H815L(Israely version). So i started to explore about the difrences, and some guys told that there is a difference in the bootloader. BUT when I got my phone into bootloader the next massage was written:" *Welcome to Fastboot Mode for bootloader unlock:
Quick Guidance
1) Read Device ID : fastboot oem device-id
2) Write Unlock Key : fastboot flash unlock unlock.bin
3) Check bootloader is unlocked : fastboot getwar unlocked"
As you see this is a guidance how to unlock the bootloader. Now Im in some dilemma because of it.
My questions are:
1. Can I unlock the bootloader?
2. What happens if i get to hard/soft break because of it (and what is the sulution if you know)?

Downgrade from Pie to Oreo without Root and unlocked Bootloader?

Hey guys,
can someone tell me if it's possible to downgrade the stock android pie version to stock oreo without rooting my device or unlock the bootloader?
I read some threads and posts but i'm not sure, because the information is disputed.
So can i flash the old stock android without getting a brick or getting stuck in edl-mode?
Thank you for your answers

Mansil234 said:
Hey guys,
can someone tell me if it's possible to downgrade the stock android pie version to stock oreo without rooting my device or unlock the bootloader?
I read some threads and posts but i'm not sure, because the information is disputed.
So can i flash the old stock android without getting a brick or getting stuck in edl-mode?
Thank you for your answers
Click to expand...
Click to collapse
Hello,
I think that it's not possible without unlocking bootloader. The unique solution is to enter in edl-mode but this is more dangerous than unlock the bootloader. Unlock bootloader is very simple and not dangerous, you are just going to loose all of your data but with a backup this is not a problem.
Root is not necessary for that, if you need help to do your downgrade with bootloader unlocking tell me !
I'm here if you have any question or if you need help !
Pierre

Flashing via EDL Mode only works with unlocked bootloader!
Unlock Bootloader will erasing all data (reset system)!

Pierre_C said:
Hello,
I think that it's not possible without unlocking bootloader. The unique solution is to enter in edl-mode but this is more dangerous than unlock the bootloader. Unlock bootloader is very simple and not dangerous, you are just going to loose all of your data but with a backup this is not a problem.
Root is not necessary for that, if you need help to do your downgrade with bootloader unlocking tell me !
I'm here if you have any question or if you need help !
Pierre
Click to expand...
Click to collapse
Can you send me the links for unlock bootloader and oreo firmware? I can't find them

ᵀᴴᴱK!D ᴼᴿᴵᴳᴵᴻᴬᴸ ツ™ said:
Can you send me the links for unlock bootloader and oreo firmware? I can't find them
Click to expand...
Click to collapse
I don't now the link but I can explain you the process.
/!\ This will erase all of your data !!
1) Enable developer options by going to Settings > About Phone, scroll down to Build number and tap 5-7 times to enable developer option.
2) Once you enabled the Developer Options. Returned back to Settings > Developer Options > USB Debugging and OEM Unlock. Just Enable there options.
At that time you have 2 option, official option and non-official version.
- Official Version,
This method require some days because you have to ask xiaomi to send you an unlock code.
You need Windows it doesn't work on Linux.
1) Go to http://en.miui.com/unlock, click on Unlock button on the webpage now you have to login and then proceed to tap on Download Mi Unlock from the resulting page.
2) Now, proceed to put your Xiaomi Mi A2 Lite into Fastboot mode by powering it on while holding Volume Down and Power buttons simultaneously. Hold until you see your phone is booted into Fastboot mode.
3) After the successful login, the validation process will start on your phone, and for the first time, you will get a message that “You don’t have the permission to Unlock the device”
4) Now click on the “Go” button or use Go to MIUI Unlock page to receive the unlocking permission.
5) Now click on the Unlock Now and log in with your Mi account details and fill all details.
6) You will get OTP for confirmation use it to complete the process.
7) Now wait until your application gets approved, you will receive the OTP password on your phone number once it’s approved.
8) Now Open the Mi Flash tool click on unlock and pass the two pop-up. Your device will be unlocked
Non-Official but simple version :
1) Proceed to put your Xiaomi Mi A2 Lite into Fastboot mode by powering it on while holding Volume Down and Power buttons simultaneously. Hold until you see your phone is booted into Fastboot
mode.
4) Download Miniamal ADB and fastboot in you are on windows, https://forum.xda-developers.com/showthread.php?t=2317790
If you are on linux use
Code:
sudo apt-get install fastboot
Code:
sudo apt-get install adb
3) On Windows in Minimal ADB and fastboot or on Linux on the terminal enter this command
Code:
fastboot oem unlock
4) Your phone will reboot, it's unlock !
PS: Sorry for my bad English
Pierre

PC295 said:
Flashing via EDL Mode only works with unlocked bootloader!
Unlock Bootloader will erasing all data (reset system)!
Click to expand...
Click to collapse
Actually you could avoid the erasing data
When you get in to fastboot mode
hold to volume down button before and write "fastboot oem unlock" code
dont release until phone shows mi logo at the startup

How To Guide [INFO] Bootloader Unlock reference guide

Hello Everyone,
This is going to be a detailed post regarding unlocking your OnePlus 9 Pro’s Bootloader for anyone who is new to this or just wants a reference guide.
Note : This is only for Global / Europe / Indian models [Non T Mobile]. Guide for T Mobile bootloader unlocking is present here
Things to know before unlocking Bootloader:
(Edit: Apparently, Unlocking Bootloader after 11.2.3.3 retains L1 but still YMMV) Your L1 license is downgraded to L3 while the bootloader remains unlocked on your device. If in future you wish to re-lock it then the L1 license is restored without any hassle and everything works just fine.
Some apps partially or completely stop working. 2 of the most noticeable apps I have noticed personally are Netflix and Google Pay. Netflix becomes no longer installable/updatable from Play Store but sideloading and using it works just fine (Apart from the L3 license), whereas Google Pay straight up often refuses to work even when Magisk isn’t installed.
Unlocking your bootloader will wipe your storage! Please keep this in mind before proceeding to unlock your bootloader.
OnePlus does not void your warranty if you choose to unlock your phone’s bootloader, so your warranty remains perfectly intact.
Pre-requisites:
A computer having the latest platform tools installed
OnePlus 9 Pro running on the latest available OxygenOS firmware
USB Cable
30+% of charge
Steps:
(Optional) Flash the latest OxygenOS Firmware twice on your device, to ensure that both the slots on your device are populated with the same latest firmware.
Go to Settings > About phone and tap on “Build Number” about 7 times to enable Developer Options
Go to Settings > System > Developer options and enable the toggle option saying “OEM unlocking”
Go to Settings > System > Developer options and enable the toggle option saying “USB debugging”
(Optional) Ensure that ADB is functioning properly.
Connect your device to your system
Wait for the drivers and other software to finish installing
Once your device is properly visible, open a new shell and type
Code:
adb devices
Your phone should be getting a prompt asking to allow USB debugging for your system, Tap Allow
Now
Code:
adb devices
should be listing your device serial number properly
Boot to Fastboot by either:
Typing the command
Code:
adb reboot bootloader
in a shell using adb
Powering off the phone and then pressing and holding Vol Up and Vol Down while pressing down Power in order to boot to Fastboot mode
Powering off the phone and then Pressing and holding Vol Down while pressing Power in order to boot to Recovery Mode first and then Rebooting to Bootloader through it
Enabling “Advanced Reboot” in developer options and choosing the Bootloader option in the power menu
Once in Bootloader, connect your device to your system and run
Code:
fastboot devices
. It should list your phone’s serial number along with the text ‘fastboot’ written next to it.
Now type in the command:
Code:
fastboot flashing unlock
Your phone’s screen should now be asking for confirmation regarding Bootloader Unlock. Use the volume keys to navigate to the “Proceed” option and using the Power Button to confirm
Your device should now begin formatting itself and would reboot soon
Congrats! You just unlocked your OnePlus 9 Pro!

At least 11.2.3.3 retains Widevine L1 even if you unlock bootloader.
Older version had L3 problem, though.

AndroPlus said:
At least 11.2.3.3 retains Widevine L1 even if you unlock bootloader.
Older version had L3 problem, though.
Click to expand...
Click to collapse
What variant do you have ? I unlocked bootloader on my Indian variant running 11.2.3.3 and I still lost L1

oddlyspaced said:
What variant do you have ? I unlocked bootloader on my Indian variant running 11.2.3.3 and I still lost L1
Click to expand...
Click to collapse
I unlock + magisk mine once updated to OOs 11.2.3.3 LE15BA and L1 state was maintained too

@oddlyspaced : As a side effect, once bootloader is unlocked, I've notice that adb command " adb reboot bootloader " isn't working anymore too.
Vol- + poweron combo still working to go there, and I can also use developer option to tick the Advanced Reboot too that have the same effect and allows to reboot whether in fastboot or recovery

Fre$h said:
@oddlyspaced : As a side effect, once bootloader is unlocked, I've notice that adb commande " adb reboot bootloader " isn't working anymore too.
Vol- + poweron combo still working to go there, and I can have use developer option to tick the Advanced Reboot too that have the same effect and allows to reboot whether in fastboot or recovery
Click to expand...
Click to collapse
That's pretty weird. On my end everything is standard. Maybe you should try relocking and unlocking if you don't care about L1. Who know's what might end up getting ****ed in software.

On BA (EU) I can confirm L1 after unlock.

Nah ^^ Advanced Reboot does the job, so I'll be fine with that

dreinulldrei said:
On BA (EU) I can confirm L1 after unlock.
Click to expand...
Click to collapse
OOO Seems like EU Builds don't lose L1. Can you confirm if 'adb reboot bootloader' is working for you or not ? That might lead to a conclusion regarding EU builds.

Never use ADB for this; but pressing Vol Up and Down while turning on does the same. And it works, as well as extended reboot option via power key.

To clarify: I also use Magisk and Magisk Hide, just in case this is of interest.

Still L1 on 11.2.2.2AA as well after unlocked.
Also never had a problem with adb reboot bootloader or fastboot commands.

I used the command 'fastboot oem unlock' and not 'fastboot flashing unlock' yet retained widevine L1 (11.2.2.2 global/magisk stable/lsposed)

FYI, When you install the OnePlus drivers, the platform tools get installed as well, to :
C:\Program Files (x86)\OnePlus USB Drivers\Android

I tried locking my 9pro's bootloader and the device got soft bricked and did not boot, so I had to unlock bootloader again in order to make it function. Surprisingly L1 is intact now! wow!

how unlock bootloader for coloros

avid_droid said:
I'm back on Oneplus and noticed that my OEM unlock is greyed out. Tmo variant.
Click to expand...
Click to collapse
See this guide for T-Mobile variant...
How To: Unlock the T-Mobile Bootloader
Hello all, this is a quick and simple guide to unlocking your T-Mobile locked bootloader. Just a reminder: unlocking the bootloader will wipe your data. The instructions here will apply to all T-Mobile OnePlus devices. Unlock your SIM. Some...
forum.xda-developers.com

I've updated the Guide to reflect on T Mobile bootloader unlock and modified the statement regarding L1.

Can I still return the phone after unlocking bootloader?

How do I relock bootloader?

Question Root for OnePlus 9

I'm only used to using TWRP so I haven't done it any other way before, is there any easy methods to root the phone. I have tried with adb but I can never seem to copy files onto it.

Have you read any of the other threads??

[GUIDE] [Magisk] [Unlock / ROOT / Keep Root] OOS 13.1.0.500
Different variants of Magisk that are available for use : Magisk Variant Stable / Beta / Canary Release Official Android / OOS OOS 11 and above Maintainer topjohnwu Project Link GitHub Zygisk No...
forum.xda-developers.com

Bunecarera said:
Have you read any of the other threads??
Click to expand...
Click to collapse
Yeah I've tried one of the threads that includes ADB, is there any other way of doing it?

No.
You can follow my guide here or visit the thread linked above and use fastboot to boot from the rooted boot image. It's really not that difficult as long as you follow the directions properly.
You need to have unlocked your bootloader first but that's always the case.

Hi my friend you just need to unlock bootloader and flash magic zip with the help of fastboot link for magic is below the text. If you do not know how then I can just guide you. Install magic apk v22. Open settings and then select about phone, then press a lot of times where it says build number. Now open developer options and enable usb debugging, oem unlock and advance booting. Now hold down the power button, now comes any choice options select fastboot. Once you are booted into fastboot mode, connect your phone to your PC. Install adb and fastboot tools if you do not already have. Open the folder with fastboot and adb and then press at the top, write cmd. Now a cmd window will appear. Write (fastboot devices), to make sure your phone is connected properly. Now it's time to unlock bootloader. Write the following, (fastboot oem unlock) you now chess like success full unlocked. A warning will appear on your phone if you are sure you want to confirm unlocking. Press yes. (if your touch does not work then use the volume buttons to select up and down. Once you have selected, press the power button and done. Now your phone will reset itself. Set your phone quickly and from select frp lock. Activate fastboot again and open cmd with fastboot Flash now magically via fastboot and reboot.Enjoy your root.

Unable to flash TWRP

I am trying to flash the LineageOS on my Redmi Note 5 Pro (whyred). Initially, I used Windows 10 for the Xiaomi Unlock Tool. However, the Xiaomi Unlock Tool did not detect my device. So, I used this tool https://www.xiaomitool.com/V2/ to unlock my bootloader and it unlocked instantly. Now, I am using Ubuntu 21.04 (I am more comfortable using the command line here) (with android-tools-adb and android-tools-fastboot packages installed) to try to flash TWRP first.
When I connect my device, adb devices can recognise it. Then I use adb reboot bootloader to enter into fastboot. Now, fastboot devices can recognise it too. The screen of the phone shows the fastboot icon.
But, the problem comes here. I use fastboot flash recovery twrp.img and I get this error
FAILED (Write to device failed (No such device))
Click to expand...
Click to collapse
Now, when I use fastboot devices again. I don't see my device. Another change I see is press any key to shutdown written on the top left corner of the screen of my phone.
USB debugging, USB debugging security, OEM debugging are all enabled. Bootloader is unlocked (as I see in the settings). The phone is updated to latest MIUI version supported officially. And I used the same laptop and method to flash TWRP in a Redmi 3S (land) some time back.
(Posted the same question on android.stackexchange.com also) (https://android.stackexchange.com/questions/238996/redmi-note-5-pro-unable-to-flash-twrp)

Something else I experienced is that after randomly trying to get this right again and again, the command fastboot flash recovery twrp.img did not terminate or fail and got stuck.

So, this was a duplicate. I used the 5th method here and it worked for me. https://forum.xda-developers.com/t/everything-about-anti-roll-back-whyred.3816219/