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JaguarJay
Paper Tape
Posts: 1
Registered: ‎10-30-2018
Location: NL
Views: 443
Message 1 of 2

Lenovo Tab 7 Essential (TB-7304F) Bootloader

Hi, I recently bought a Lenovo TB-7304F to use in my car as an infotainment display, but I would like to root it to gain full control over any power related settings. I know this will probably void my warranty but I don't care that much.

 

The first hurdle was to get the bootloader unlocked, but this wasn't as easy as it seemed. Using ADB I can connect to the tablet and put it into fastboot mode. When in fastboot mode, the device answers to both the <fastboot devices> command and the <fastboot getvar all> command, returning the proper values. Most importantly (as far as I know), it returns these values:

(bootloader)    off-mode-charge: 1
(bootloader)    warranty: yes
(bootloader)    unlocked: no
(bootloader)    secure: yes
(bootloader)    kernel: lk
(bootloader)    product: HQ8167_TB_N
(bootloader)    version-preloader: 0.1.00
(bootloader)    version: 0.5

 

However, whenever I want to use any form of unlocking the bootloader (<fastboot oem unlock> or <fastboot flashing unlock>) the command prompt returns the lines:

FAILED (remote: 'unknown command')
Finished. Total time: 0.00Xs

Is there any way to unlock the bootloader so I can finally get to work on rooting this device?

 

EDIT: Forgot to mention that "OEM Unlocking" in the developer settings is turned on

 

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lukgaucho77
Paper Tape
Posts: 1
Registered: ‎11-08-2018
Location: IT
Views: 233
Message 2 of 2

Re: Lenovo Tab 7 Essential (TB-7304F) Bootloader

Hi, i want to use this tablet for the same reason......standard command found online doesn't work (fastboot oem unlock,fastboot oem unlock-go,fastboot flashing unlock).It seems that no oem command are not recognized. Also I try different adb driver or fastboot exe (Minimal ADB and Fastboot,platform-tools) with no success. No help from Lenovo Support  and i don't think security code is needed for bootloader unlock.A strange thing is that the only adb driver working for me is Alcatel ADB driver....

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