chromebook hp pro c640 help

[dhan]

please help fix the issue:
lock enterprise.
I manage to remove the lock enterprise and re install chromeOS but NO AUDIO.

Machine: Laptop Chromebook
Brand: HP
Model: HP Pro c640 chromebook enterprise
SN: 5CD043115B

[Jakab75]

I would like some help.

I tried to install Windows on an HP Pro c640 Chromebook Enterprise
After running firmware-util.sh, the machine displays nothing but a black screen.
It doesn't display an image via the HDMI port either.
Powervash (f3+Power button) restarts the machine.
I tried connecting it with a black CH341a, it didn't detect it. EZP2023+ didn't detect the W25Q128JVSM chip either.
This backup was made by firmware-util, but when compared to a bios downloaded from here, something really went wrong.

stock-firmware-DRATINI-20241022.zip
ProdID 3L347AW#ABF
SN# 5CD044J449
I just need a bios that can be installed on this model, an installation manual.
And a huge dose of miracles..... 😔

[SMDFlea]

I would like some help.
I tried connecting it with a black CH341a, it didn't detect it. EZP2023+ didn't detect the W25Q128JVSM chip either.
This backup was made by firmware-util, but when compared to a bios downloaded from here, something really went wrong.
ProdID 3L347AW#ABF
SN# 5CD044J449

Attach the bios to your post in a zip or rar archive. https://www.badcaps.net/forum/troubl...before-posting

[MigElite]

I also have a HP Chromebook Pro C640 with sound issue after unlocking. I was able to remove the enterprise lock. I used the BIOS from another unlocked C640. But just like someone else here mentioned, the sound is gone. The sound bar is greyed out and pressing the mute or volume buttons does nothing. There's also no sound from the audio jack, so its not a problem with the speakers. I returned back to the locked BIOS and the sound returned. Strange.

[volinakis]

I also have a HP Chromebook Pro C640 with sound issue after unlocking. I was able to remove the enterprise lock. I used the BIOS from another unlocked C640. But just like someone else here mentioned, the sound is gone. The sound bar is greyed out and pressing the mute or volume buttons does nothing. There's also no sound from the audio jack, so its not a problem with the speakers. I returned back to the locked BIOS and the sound returned. Strange.

upload your original backup of bios chipset along with serial no. and you'll get help.

[MigElite]

Thank you. Here is my original backup of the bios. The serial number is 5CD051CCM1

[lint4u]

Thank you. Here is my original backup of the bios. The serial number is 5CD051CCM1

Try this

[MigElite]

Amazing! It worked out. Thank you soo much!!

Here are some notes for other people trying this: Do Not connect the power cord while flashing BIOS (it can brick the chromebook and you have reflash again). After you flash the BIOS, plug in the power cord before turning on. Press Esc Refresh and power to boot into recovery. Use a USB drive to reinstall the Chrome OS.

[Mudau]

hi please remove enrollment for me hp c640
SN= 5CD41670PF

[lint4u]

hi please remove enrollment for me hp c640
SN= 5CD41670PF

Try this one...

[krogs214]

Hi anyone can help me to unlock enterprise
HP elite c640 g3 chromebook
sn : 5CD423BLJ5

[peste]

Hi anyone can help me to unlock enterprise
HP elite c640 g3 chromebook
sn : 5CD423BLJ5

try.. W25Q256JVXXM-DTR@WSON8 8X6_20250407_ghknew.rar

[krogs214]

try.. [ATTACH]n3609633[/ATTACH]

hi its not turning on after i flash this bin

[krogs214]

anyone can create a clean bin and unlock enterprise for hp elite c640 g3 chrome
sn : 5CD423BLJ5,
i think my backup is already corrupted,

[peste]

put the original bios back, the one with the password, see if the laptop starts up again.

[krogs214]

yes already did and its not turning on, possible i did not backup properly,
but its ok now

I go to the HP site and download the recovery installer, extract all via 7-Zip, and search for bios/bin. Luckily, I found it.
Just to share this stock BIOS/BIN for the HP Elite c640 G3 Chromebook

[tauzman]

hello i need help to unlocked bios
hp elite c640 g3 chromebook enterprise
S/N : 5CD41670T0

[SMDFlea]

Post moved from c640 g3 intel bios thread to c640 g3 chromebook topic

[jawal37]

please i need to unlock it
serial number : 5CD33131C7

[lint4u]

please i need to unlock it
serial number : 5CD33131C7

Try this one and report

[jawal37]

thanks for support bro laptop working

[Omaluy23]

please i need to unlock it

hp elite c640 g3 chromebook

Hi! can also unlock my file?