Develop Bugs

[Q] Cannot open fastboot after BL unlock

I unlocked my BL and after that when I reboot my phone with volume up pressing nothing happens. Why? what should I do ?

To enter fastboot mode you don't need to reboot, simply press Volume + and plug it onto the PC while the device is POWER OFF , it should indicate the fastboot mode with a blue LED

[SOLVED] Can not unlock the phone (lockscreen) & can not enter into fastboot mode

Hello.
This could be more general question so I try to get an answer here. Device: H815 wit bootloader unlocked. USB debugging is enabled but PC is not authorized so I can not execute any ADB command.
My problem is simple, I have flashed the latest Genisys rom and after initial setup (included lockscreen pattern setup) I restarted the phone. No I am not able to unlock the phone with correct lockscreen pattern provided. When I "connect" three dots it says "Try again", when I connect four and more dots it stucks and I can not swipe another pattern.
I am also unable to enter into recovery/fastboot mode (with power+vol down buttons). The phone starts booting instead of boot into the fastboot mode.
Is there any way how to flash anything or delete files containing lockscreen pattern?
Thank you very much for any help.
Babi
EDIT: Solved with LGUP.

when you attempted to go into recovery by holding power + vol down, did you let go of the power button and hold again immediately (while keeping vol down hold) when LG logo showed up?
anyways, if you can get ADP to detect your device, you can use this command to remove lockscreens
rm /data/system/locksettings.db
rm /data/system/*.key
or if you able to get into TWRP, find that folder and delete those files manually.
sorry i'm at work and can't type long, but let us(community) know.

Yes I did. I tried it with volume down button released as well. So I am not able to enter into fastboot mode. This issues persists.
I know about these commands, but how can I execute these commands without authorized device (ADB litsts "unauthorized" device)?
No, I was also not able to enter into recovery mode.

LG G4 H815 bootloader unresponsive

Hi all,
I am trying to root my device. first step as I understand it would be to unlock my bootloader.
When run "adb reboot bootloader" the phone reboots and loads into what looks to me like the bootloader (text screen that says "bootloader" and gives hints on how to use it, like running the fastboot command to get the device id and pressing the power for more than 10 seconds to shut down).
Unfortunately when i attempt to use the fastboot command the utility says "< waiting for any device >".
Additionally, pressing the power button for more than 10 seconds does not shut down the device (i press for over 30 seconds). I need to remove the battery in order to restart the phone.
I am running android 6 and my device is an H815.
any suggestions? I really need help!

liorti said:
Hi all,
I am trying to root my device. first step as I understand it would be to unlock my bootloader.
When run "adb reboot bootloader" the phone reboots and loads into what looks to me like the bootloader (text screen that says "bootloader" and gives hints on how to use it, like running the fastboot command to get the device id and pressing the power for more than 10 seconds to shut down).
Unfortunately when i attempt to use the fastboot command the utility says "< waiting for any device >".
Additionally, pressing the power button for more than 10 seconds does not shut down the device (i press for over 30 seconds). I need to remove the battery in order to restart the phone.
I am running android 6 and my device is an H815.
any suggestions? I really need help!
Click to expand...
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Please reply somebody

Stcked after wrong firmware update

hi everyone, today i tried to upgrade my g7 G710ULM whith LGUP but in the procees i got an error, now i have the phone stucked into a fastboot screen like that:
Press the volume key to select, and press power key to select
Welcome to fastboot for bootloader unlock:
please check "Enable OEM unlock" in developer options
* Quick guidance
1)Read device ID
:fastboot oem device-id
2)Write Unlock Key
:fastbook flash unlock unlock.bin
3)Check bootloader is unlocked
:fastboot getvar unlocked
i can't pass this screen, i tried whit fastboot reboot but get the same, tried to hard reset but i get de same screen afer select yes option, when i try to get into download mode get de same screen as soon as i enter this mode.
any ideas to solve this problem?

Lo resolviste bro?

re flash correct stock KDZ file with newer LG up V1.15

Hold vol dwn and power till it shuts off then quickly plugin the usb cable from your pc and hold vol up while you plug it in and wait till download mode shows up.

Is my bootloader properly unlocked?

Hello.
Following the Magisk installation guide here (and cross checking with other source), once I have unlocked the Bootloader via OEM unlocking in the developer options, I still need to restart the device in download mode and long hold the volume up key. Looking at some bootloader another Samsung bootloader unlocking guide, it seems that there should be a warning screen where I can press volume up to "Continue" (into download mode), long press volume up for "Device unlock mode" (i.e. unlock bootloader) or volume down to cancel and restart the phone.
However, in my case, there is no long press volume up options, and if I try to long press, it would just register the volume up press and directly send me to download mode.
Perhaps as a result, the OEM unlocking option is never "Greyed out" (it does say Bootloader is already unlocked though).
Is this normal on the Tab S4? Does the VaultKeeper service exist in the Tab S4?
(I am on Android 10, March 2021 security update)
Thanks.

It should be unlocked, I am not sure.
If you flash twrp, PLEASE Disable auto reboot in the Odin options tab.

我也是这种情况。降级时提示bl没有解锁，但我已经解锁了oem并重启提示bl已经解锁。如果你成功了，给我看看