HP Chromebook 11 G4 Black Screen after Flash UEFI ROM

[japersonpadin]

HP Chromebook 11 G4
After the last step of uefi flash ( reboot )
Only black screen

• I already do unbricking guide in your website using ch341a it succes flash but still black screen nu luck can you help me ❤️
  
  
  

[MrChromebox]

this is a KIP device? just flash the latest UEFI image

[japersonpadin]

this is a KIP device? just flash the latest UEFI image

How 🥹

[japersonpadin]

This is the last step ill take before black screen
After reboot mo display

[MrChromebox]

re-flash coreboot_edk2-kip-mrchromebox_20240914.rom

https://mrchromebox.tech/files/firmware/full_rom/coreboot_edk2-kip-mrchromebox_20240914.rom

[japersonpadin]

re-flash coreboot_edk2-kip-mrchromebox_20240914.rom

https://mrchromebox.tech/files/firmware/full_rom/coreboot_edk2-kip-mrchromebox_20240914.rom

how to reflash?
what tools used?
do you have guide?

[MrChromebox]

the exact same way you flashed before, using a ch341a USB programmer.

the guide is on my site.

[japersonpadin]

ok thank you 😊 i hope it will work

[japersonpadin]

Still no luck 🥲 no display

[MrChromebox]

then I suspect something else is wrong with the hardware, if neither the stock backup nor the UEFI image will boot on the device

[YTEC-info]

  ![IMG_3011](https://private-user-images.githubusercontent.com/41370359/401584891-2f6de8f6-4270-4938-baf0-4a4c3047312d.jpeg?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MzY1MTc0MjUsIm5iZiI6MTczNjUxNzEyNSwicGF0aCI6Ii80MTM3MDM1OS80MDE1ODQ4OTEtMmY2ZGU4ZjYtNDI3MC00OTM4LWJhZjAtNGE0YzMwNDczMTJkLmpwZWc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMTEwJTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDExMFQxMzUyMDVaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hODVkZjMwYjg5MTFiMjliOWVhNDNiYzNiZGI4YzY1MDY3ZGM5MzNjYmQ0NTAzNzAxOGQ3NDA0ODA2ZmY2ODAxJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.5ULpmFk5QJA88HQJP8SZW3A35_S1DLPuS7NfWkfmWvM)

I hope there is some protection underneath the board to prevent a short circuit with the computer 🤯

[japersonpadin]

  ![IMG_3011](https://private-user-images.githubusercontent.com/41370359/401584891-2f6de8f6-4270-4938-baf0-4a4c3047312d.jpeg?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MzY1MTc0MjUsIm5iZiI6MTczNjUxNzEyNSwicGF0aCI6Ii80MTM3MDM1OS80MDE1ODQ4OTEtMmY2ZGU4ZjYtNDI3MC00OTM4LWJhZjAtNGE0YzMwNDczMTJkLmpwZWc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMTEwJTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDExMFQxMzUyMDVaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hODVkZjMwYjg5MTFiMjliOWVhNDNiYzNiZGI4YzY1MDY3ZGM5MzNjYmQ0NTAzNzAxOGQ3NDA0ODA2ZmY2ODAxJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.5ULpmFk5QJA88HQJP8SZW3A35_S1DLPuS7NfWkfmWvM)

I hope there is some protection underneath the board to prevent a short circuit with the computer 🤯

Yes it have underneath protection plastic coated

[japersonpadin]

then I suspect something else is wrong with the hardware, if neither the stock backup nor the UEFI image will boot on the device

Yes i think so, my #1 suspect is emmc
Is it possible to do flashing or write / erase on emmc via isp pin out ?

[japersonpadin]

Im wondering when the device is power on there are something black dim in screen and disappeared immediately, i think device is booting but due to compatibility issue the result is no display output . Correct if im wrong 🙂

[MrChromebox]

if the display backlight is coming on, that means it's booting to a certain point at least. It's possible that some KIP boards don't like the edk2 GOP driver init, so I'll build you one with the older legacy VBIOS init to try

[MrChromebox]

try this image with VGA BIOS init and see if it works for you

coreboot_edk2-kip-mrchromebox_20250110.zip

[japersonpadin]

No luck 🥲

try this image with VGA BIOS init and see if it works for you

coreboot_edk2-kip-mrchromebox_20250110.zip

No luck 🥲

[MrChromebox]

does the screen backlight come on with that test image?

[japersonpadin]

does the screen backlight come on with that test image?

no dim only completely black, now the status is totaly dead i already parts all components and transplant

[MrChromebox]

very strange. can you re-flash the stock firmware?