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[Recovery] [YB1-X90L] TWRP

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By danjac, Senior Member on 7th January 2017, 08:56 PM
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15th April 2017, 08:58 AM |#21  
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Originally Posted by joesnose

@danjac Hi, did you keep the boot to bios option in the reboot menu?

hi it's still there but won't boot into bios
15th April 2017, 09:59 AM |#22  
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Quote:
Originally Posted by danjac

hi it's still there but won't boot into bios

I may have the fix if you are interested. I have the yoga tab 3 pro and after a few changes in bios can boot linux from usb. No sound, touchscreen or graphics acceleration but it works. WindowsPE and "windows to go" give bluescreen and acpi bios error, I have tried many changes in bios but can only get linux and android x86 to boot.

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17th April 2017, 07:28 AM |#23  
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Originally Posted by joesnose

I may have the fix if you are interested. I have the yoga tab 3 pro and after a few changes in bios can boot linux from usb.

Hey, sounds interesting...yes ofcourse, why not.
18th April 2017, 11:36 AM |#24  
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Quote:
Originally Posted by joesnose

I may have the fix if you are interested. I have the yoga tab 3 pro and after a few changes in bios can boot linux from usb. No sound, touchscreen or graphics acceleration but it works. WindowsPE and "windows to go" give bluescreen and acpi bios error, I have tried many changes in bios but can only get linux and android x86 to boot.

Sent from my Nexus 6P using Tapatalk

hey, sorry for being impatient...

what should i do to boot into bios?
thx in advance
18th April 2017, 12:14 PM |#25  
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Hi sorry danjac, so this works fine for yoga tab 3 pro. I have done this on lollipop and marshmallow without problems. I must stress that you try this at your own risk. Becareful in the bios as you don't want to do anything to create a nice paperweight.

Manual boot to bios,

Try this at your own risk!!!!

This is magic code from Microsoft apparently. Feel free to google it.

These commands need entering one by one from adb shell. They need to be exactly right!!!!!!!!!!!


mount -t efivarfs efivarfs /sys/firmware/efi/efivars

printf "\x07\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\ x00" > /sys/firmware/efi/efivars/OsIndications-8be4df61-93ca-11d2-aa0d-00e098032b8c

reboot

Tablet should boot to bios, you can navigate with the buttons. POWER=enter, vol+/- =navigate menus and long press vol+=Esc.

After using the commands from adb once the reboot to bios option should work in twrp.

Not at my tablet at the moment, will post which options need changing to allow usb keyboard and usb stick support shortly.

Device manager

System setup

android. Uefi secure BOOT=disable.

South cluster configuration. Usb configuration/default drd CONFIG=hostmode
Usb VBUS=on


If you want to be able to interupt boot to select usb device also disable fast boot under boot catergory. Then use f7 to select boot device.

After booting another os from usb it often takes 3 boots to get back to android, don't panic.

Oh and lastly a powered usb hub is needed.


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20th April 2017, 05:47 AM |#26  
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Thanks for the info again. Unfortunately, I didn't manage to get into bios yet.
20th April 2017, 12:50 PM |#27  
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Quote:
Originally Posted by danjac

Thanks for the info again. Unfortunately, I didn't manage to get into bios yet.

Did you try the adb commands?

Sent from my Nexus 6P using Tapatalk
20th April 2017, 08:37 PM |#28  
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Originally Posted by joesnose

Did you try the adb commands?

Sent from my Nexus 6P using Tapatalk

good news, it works. i was able to boot into bios.
but i had to use the terminal in twrp (in the advanced tab)...don't know whether it was obvious to do it there.

nevertheless, this is a great development...
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20th April 2017, 08:38 PM |#29  
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Quote:
Originally Posted by danjac

good news, it works. i was able to boot into bios.
but i had to use the terminal in twrp (in the advanced tab)...don't know whether it was obvious to do it there.

nevertheless, this is a great development...

This is excellent news, maybe this will get more people on board!

Have you managed to boot anything from usb?

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22nd April 2017, 08:05 AM |#30  
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Quote:
Originally Posted by joesnose

Have you managed to boot anything from usb?

not yet, don't have a lot of time at the moment...but will try any time soon, for sure! will report back then!
8th July 2017, 05:36 PM |#31  
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Lenovo Yoga Tab 3 Pro X90-L [2GB 32GB 4GLTE][PARTITION ERROR]
My yoga tab requires repartitioning please some one help me to find perfect rom for this mode and then help me with flashing it up. There is a folder in internal memory named "proc" whose size is increasing going upto millions of GB.
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