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Putting your LG G7 / V40 into QDLoader 9008 mode (a mode for recording the engineering bootloader for Snapdragon chipsets):

1) Connect the included and charged smartphone to the PC via USB;
2) Hold and hold the buttons to restart [Vol-Power], or [Vol-Vol + Power] (so as not to take a screenshot). A countdown will appear (4 seconds);
3) As soon as the screen goes out, quickly and constantly click only on Vol +, continue to hold the remaining buttons (Vol- and Power) without releasing;
4) The screen will remain black, and on the PC the smartphone will become visible as a Qualcomm HS-USB QDLoader 9008 device.

To Exit (if you suddenly need it) hold the buttons: [Vol-Power], or [Vol-Vol + Power].

hi, it will be useful for beginners, root instruction, detailed
https://youtu.be/8b38cCfzMaY

bootloader unlock on all G7, V35, V40 models
https://remote-unlock-service.com/en/unlock-bootloader

The bootloader unlock service includes:
Unlock bootloader
Installing Fastboot + Download mode
Full root (or instructions and necessary files)
A ​​set of useful instructions for further firmware, etc.

Current Bootloader Unlock Prices:
Unlock bootloader G4 all model - 05.00 USD
Unlock bootloader G7 all model - 10.00 USD
Unlock bootloader V30 all model - 05.00 USD
Unlock bootloader V35 all model - 10.00 USD
Unlock bootloader V40 all model - 10.00 USD

Unlocking the bootloader anywhere in the world - https://remote-unlock-service.com/en/unlock-bootloader

If S/N from the settings disappeared with the firmware, Gpay does not work, there is no certification, then you can order the serial number recovery service.
https://remote-unlock-service.com/en/restore-sn

By the way, a full-fledged fastboot + download mode appeared on those LGs where fastboot is blocked from the factory.
Now you do not need to delete Download mode so that the phone goes to fastboot.

Download mode - volume up button
Fastboot mode - volume down button

In fastboot, you can go even through adb or applications.
if you are interested in a new method, you can order it from us! for those customers who did the old fastboot (instead of download mode) there will be a discount!
the phone can be flashed in Refurbish / Upgrade modes, this will not remove fastboot

The bootloader unlock service includes:
Unlock bootloader
Installing Fastboot + Download mode
Full root (or instructions and necessary files)
A set of useful instructions for further firmware, etc.

Current Bootloader Unlock Prices:
Unlock bootloader G4 all model - 05.00 USD
Unlock bootloader G7 all model - 06.00 USD
Unlock bootloader V30 all model - 03.00 USD
Unlock bootloader V35 all model - 06.00 USD
Unlock bootloader V40 all model - 06.00 USD

Unlocking the bootloader anywhere in the world - https://remote-unlock-service.com/en/unlock-bootloader

How to transfer the phone LG G7, G8, G8s, V30, V35, V40, V50 and others to the service mode QDLoader 9008

Transfer the smartphone to 9008 mode:
We connect the smartphone via USB to the computer
On the smartphone turned on, hold VOL + VOL- and POWER (sometimes only VOL- and POWER)
as soon as the screen turns off, keep holding the VOL- and POWER buttons and simultaneously press VOL +
the smartphone will have a black screen, and the dispatcher will have "QUSB_BULK_CID: xxxx_SN: xxxxxxxx" or "Qualcomm HS-USB QDLoader 9008 (COM x)"