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15.6 Chuwi LapBook not booting any more

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Linal|Post time:9-19-2017 15:19:40 View:789|Reply:3

Edited by Linal at 4-13-2018 20:47

Hello folks,

my 15.6 Chuwi LapBook was only working about 24h.
Than, it booted only into the EFI Shell.

The reason is probably a bad hardware design of the Chuwi Lapbook 15.6.
The Chuwi Lapbook 15.6 lose the EFI flash under some circumstances such as getting to hot or just switched off at the wrong time!
If the EFI flash is lost you end up with the EFI Shell prompt.

Here is what worked for me to get it running again.
The good news: You can boot from the EFI shell into the grub boot-loader / your Linux.
  I'm using Majaro Linux but the instructions a general enough to work with all Linux Distros.
  On the prompt you enter the MANUAL EFI SHELL BOOT PROCEDURE:
  1. fs0:<Enter>
  2. cd <Tab><Enter>
  3. cd <Tab><Enter>
  4. cd <Tab>
Copy the Code
This leads at my setup to:
cd to the EFI partition
cd to the EFI directory
cd to the manjaro directory
point to the grub boot loader grubx64.efi
This is the same structure you usually find at /boot/efi/ when everything is fine with your PC.
When you press now <Enter> when the shell display the grubx64.efi boot loader file, your PC boot into your Linux.

When your Linux is loaded, check for the efibootmgr and install it if missing.
efibootmgr -v
Should give you an output like:

BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000
Boot0000* UEFI: Built-in EFI Shell      VenMedia(5023b95c-db26-429b-a648-bd47664c8012)..BO

If you get such an output, you can't repair the EFI flash, jet.
You need to reset the EFI ROM to become ready to write permanent to the EFI flash.
Likely an EFI ROM bug.
Switch the LabBook off (hold the off switch 30s or more down).
Switch it on and press <Delete> several times until you in the EFI ROM Setup
Go to the “Save & Exit” menu.“Reset System with ME disable ModeMEUD000” <Enter>
Wait 3 minutes.
If it is still just a black screen after 3 minutes, re-power.
You probably back to the EFI Shell prompt.
Repeat the MANUAL EFI SHELL BOOT PROCEDURE to boot again into your Linux.

efibootmgr -v
Should give you now an output like:

BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0000,0001,0002,0003
Boot0000* UEFI: Built-in EFI Shell      VenMedia(5023b95c-db26-429b-a648-bd47664c8012)..BO
Boot0001* UEFI:CD/DVD Drive     BBS(129,,0x0)
Boot0002* UEFI:Removable Device BBS(130,,0x0)
Boot0003* UEFI:Network Device   BBS(131,,0x0)

See the difference ?
Some extra entries.
If you don’t see this extra output, repeat the “Reset System with ME disable ModeMEUD000”.

Another Chuwi bug.
Once you see the extra entries your EFI flash can be fixed.


Adding the missing info to your EFI Flash.
If you have additional entries in the Boot0000 Boot0001 Boot0003 ... list that you want clean up (delete),
this command will delete “Boot0001”
efibootmgr -b 1 -B
efibootmgr -b 2 -B  For delete “Boot0002”.

If your setup don't need anything to delete, or you done, lets add the lost Boot Entry.

efibootmgr -c --disk /dev/mmcblk0 --part 2 -l /EFI/manjaro/grubx64.efi --label "Manjaro"

This is the command that works for me.
You need probably change the “--part 2” number to the number you see in the little red cycle in the Shell screen photo.
The line that starts with fs0.
If you have a different Distro than Manjaro than you have likely also to change the path to the grub boot file on
the EFI partition. Forward slashes ! Case sensitive ?
Use the exact label your Distro uses. Check with:
efibootmgr -v
Should give you now an output like:

BootCurrent: 0001
Timeout: 1 seconds
BootOrder: 0000,0001,0002,0003,0004
Boot0000* Manjaro       HD(2,MBR,0xde450a1c,0x32800,0x32000)/File(\EFI\manjaro\grubx64.efi)
Boot0001* UEFI: Built-in EFI Shell      VenMedia(5023b95c-db26-429b-a648-bd47664c8012)..BO
Boot0002* UEFI:CD/DVD Drive     BBS(129,,0x0)
Boot0003* UEFI:Removable Device BBS(130,,0x0)
Boot0004* UEFI:Network Device   BBS(131,,0x0)

This is how a working persistent EFI Flash should look like.
And no, grub-install will not work. No persistent Boot Entry.

Your PC should now boot as before it lost its EFI Flash.

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manonegra222| Post time 8-29-2017 14:46:30 | Show all posts
I could not see the video because it is in process on Youtube, but for what you explain, if the computer is left standing on a screen to select the boot, the problem is the internal memory eMMC is broken. The only solution to this is to change it, so you must open a ticket on the seller so that you change the equipment for another or you return the money paid.
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manonegra222| Post time 8-29-2017 22:36:20 | Show all posts
I have been able to watch the video and keep what I said. It does not detect the eMMC internal storage drive. Get in touch with the seller and if you paid for PayPal, open a dispute
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Linal| Post time 9-19-2017 15:19:40 | Show all posts
Hello manonegra222,

I fixed the problem with a other USB DVD with lower power requirement.
I could boot from DVD with this drive and fix the MBR (master boot record) of the eMMC (internal "drive")
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