# [GUIDE] Unlock bootloader of Lenovo Tab 4 10 with OEM unlock "greyed out" (TB-X304F/L and other Qcom tablets)

#### edwx

##### New member
Didn't even have to cry into my bricked tablet, thanks a bunch.

#### Ankitpandey2

##### Member
I Tried this on my tab but,
It says """Failed to send Hello.
Unable to ... Sahara ...
Blah blah blah.."""
It don't dump anything and my bootloader is also not unloacked
what to do now...

pls help anyone I really need help
anyone who wants to help me and contact me personally
telegram = ankitpandey250
instagram = ankitpandey2502

pls help me in unlock my tabs bootloader...

#### Rainberry

##### Member
I Tried this on my tab but,
It says """Failed to send Hello.
Unable to ... Sahara ...
Blah blah blah.."""
It don't dump anything and my bootloader is also not unloacked
what to do now...

pls help anyone I really need help
anyone who wants to help me and contact me personally
telegram = ankitpandey250
instagram = ankitpandey2502

pls help me in unlock my tabs bootloader...
join this group and we may be able to help you.
here we discuss many of the issues with the lenovo tablets and stuff..so join this group and we will help you out.

#### ravenchaser210

##### Member
was doubting this at first, because alot of people was having problems, but holy it works for me!! Thanks!

#### Ankitpandey2

##### Member
was doubting this at first, because alot of people was having problems, but holy it works for me!! Thanks!
hi, pls join above group and pls will u help me...

#### Ankitpandey2

##### Member
join this group and we may be able to help you.
here we discuss many of the issues with the lenovo tablets and stuff..so join this group and we will help you out.
sure..

#### Vishwajeet Bhamre

##### Member
WARNING: DO THIS AT YOUR OWN RISK !!!!
I AM NOT RESPONSIBLE IF YOU START CRYING INTO YOUR BRICKED TABLET

This guide is only for devices with "OEM Unlocking" option greyed out !!!
Others can follow the simpler procedure mentioned in the TWRP thread...

Prerequisites:
Hex Editor (eg. HxD)
PC and some brain to understand....

Procedure:

1. Install the drivers and hex editor.
2. Clone this repo to PC - https://github.com/Naveen3Singh/BLUnlocker (Thanks to the dev )
3. Extract the firehose file from stock rom. (eg. "prog_emmc_firehose_8917_ddr.mbn" for TB-X304)
4. Boot into edl mode using key combo
Code:
adb reboot edl
5. Check the port number in device manager and run " dump_devinfo.bat ".
6. Mention port number and full path to "*.mbn" file (eg. D:\where\every\it\is\prog_emmc_firehose_8917_ddr.mbn)
7. A file named " devinfo.img " will be dumped to the working dir. Edit it using an HEX editor as shown below.View attachment 5154947
8. Save the devinfo.img after editing and run " unlock.bat "
9. Reboot after success message.
10. Voila !! You have Successful unlocked the bootloader. Reboot to system by holding the power button.
EDIT (13/01/2020): After unlocking bootloader and restarting, if it asks for password, Reboot to recovery and format data...

Flash TWRP and Enjoy rooting...

View attachment 5154955View attachment 5154957

PS: The same procedure can be done using QFIL tools (QPST)

Attached:
Firehose file of TB-X304F and TB-X304L (DONT USE ON OTHER DEVICES!!!)

Credits:
Thanks to the dev who wrote the code ( https://github.com/Naveen3Singh )
@hk96 (Myself)

Hit thanks if this helped....
I am facing same problem please can you give video solution

#### Shutupboomer

##### Member
Hey! so uhh after doing the 6th step it says (see the image) and I can't find the devinnfo.img file anywhere on my PC. Please tell me what to do. I have all the drivers and files needed..... I dont know what I am doing wrong. Please help!

#### Attachments

• Screenshot 2021-10-19 091216.png
40.4 KB · Views: 25
Last edited:

#### Shutupboomer

##### Member
Hey bro, It says Status 21: Device is not ready. But my tablet is in edl mode

Last edited:

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• 12
WARNING: DO THIS AT YOUR OWN RISK !!!!
I AM NOT RESPONSIBLE IF YOU START CRYING INTO YOUR BRICKED TABLET

This guide is only for devices with "OEM Unlocking" option greyed out !!!
Others can follow the simpler procedure mentioned in the TWRP thread...

Prerequisites:
Hex Editor (eg. HxD)
PC and some brain to understand....

Procedure:

1. Install the drivers and hex editor.
2. Clone this repo to PC - https://github.com/Naveen3Singh/BLUnlocker (Thanks to the dev )
3. Extract the firehose file from stock rom. (eg. "prog_emmc_firehose_8917_ddr.mbn" for TB-X304)
4. Boot into edl mode using key combo
Code:
adb reboot edl
5. Check the port number in device manager and run " dump_devinfo.bat ".
6. Mention port number and full path to "*.mbn" file (eg. D:\where\every\it\is\prog_emmc_firehose_8917_ddr.mbn)
7. A file named " devinfo.img " will be dumped to the working dir. Edit it using an HEX editor as shown below.
8. Save the devinfo.img after editing and run " unlock.bat "
9. Reboot after success message.
10. Voila !! You have Successful unlocked the bootloader. Reboot to system by holding the power button.
EDIT (13/01/2020): After unlocking bootloader and restarting, if it asks for password, Reboot to recovery and format data...

Flash TWRP and Enjoy rooting...

PS: The same procedure can be done using QFIL tools (QPST)

Attached:
Firehose file of TB-X304F and TB-X304L (DONT USE ON OTHER DEVICES!!!)

Credits:
Thanks to the dev who wrote the code ( https://github.com/Naveen3Singh )
@hk96 (Myself)

Hit thanks if this helped....
1
Thank you very much! It worked perfectly!
1
Firehose file for X304L if anyone needs it
1
Great! I also have this problem...
Does unlocking in this way factory resets the tablet?
Is the "firehose" file version sensitive (i.e., if I use the S001016 file in a S001014 TB-X304F will I have any kind of trouble?)
Thanks!
After unlocking, when u Boot into system it asks for a password, even if u didn't set one to start with (atleast in my case).
So you need Boot into recovery and wipe data.
Short answer: yes, factory reset is necessary.

Regarding file version, I hav no idea... May be u can give it a try...
1
I just tried to do this. I installed the drivers, my tablet was seen by my computer and I am connected to port 0001. When I run the dump_devinfo.bat file, it starts and looks like it gives some errors. But then it will continue for a few minutes and then tell me the devinfo.img file was saved to the current directory. But nothing is in the directory I am working out of. Am I doing something wrong here? Does it have something to do with the errors it is showing? I attached a screenshot of what it tells me.

Also, is it normal for USB Debugging to be greyed out as well? I don't know if that has any effect on EDL mode.