HP EliteBook 640 G9 Bios password

[vilmar27@hotmail.com]

Here you go...

Hi, Stefan!
I would like to express my sincere gratitude for you help. After applying the modified BIN file, the onboard network card is now functioning perfectly😁

Please, I would be very grateful if you could explain what other changes are necessary—besides modifying the MAC address at line 00001000 for the NIC to work properly when I change the MAC address?

Best regards,
Vilmar

[Radny Canoy]

try

Work like a Charm boss, Thank you so much, very much appreciated.

password is gone and company boot splash gone too, just a little work for DMI.

once again, thank You Sir!

[Stefan Steff]

Hi, Stefan!
I would like to express my sincere gratitude for you help. After applying the modified BIN file, the onboard network card is now functioning perfectly😁

Please, I would be very grateful if you could explain what other changes are necessary—besides modifying the MAC address at line 00001000 for the NIC to work properly when I change the MAC address?

Best regards,
Vilmar

You need to recalculate the CRC word (last two bytes) of the modified Gbe region after changing the MAC address bytes.
The Checksum word (Word 0x3F, NVM bytes 0x7E and 0x7F) is used to ensure that the base NVM image is a valid image. The value of this word should be calculated such that after adding all the words (0x00- 0x3F) / bytes (0x00-0x7F), including the Checksum word itself, the sum should be 0xBABA. The initial value in the 16 bit summing register should be 0x0000 and the carry bit should be ignored after each addition.

[vilmar27@hotmail.com]

You need to recalculate the CRC word (last two bytes) of the modified Gbe region after changing the MAC address bytes.
The Checksum word (Word 0x3F, NVM bytes 0x7E and 0x7F) is used to ensure that the base NVM image is a valid image. The value of this word should be calculated such that after adding all the words (0x00- 0x3F) / bytes (0x00-0x7F), including the Checksum word itself, the sum should be 0xBABA. The initial value in the 16 bit summing register should be 0x0000 and the carry bit should be ignored after each addition.

Hello, Sfefan!
Again thanks a lot for help and explanation.

Please, have you some tools or easy type to recalculate the CRC and update the BIOS BIN file with changed MAC Address? (I tried to use the UEFI_Tools NE to extract the Gbe Region, change with Phyton acript attached, and after Rebiuld again, but is not easy....).

Or if I change only first two digits of MAC Address is not necessary to recalculate the CRC?

Example: From 7C:57:58:6C:F0:5A to 8C:57:58:6C:F0:5A (If I use this same BIN file to fix other unit I will need to change the MAC Address again to avoid conflit in the network enviorement).

Best Regards,
Vilmar

[vilmar27@hotmail.com]

Hello,
Please, I really apreciate if you can help me with one more information.

I would like to save to reuse the Windows activation key from the old BIN file with issues so I can reinsert it later when tattoo with DMI after fix the System with new BIN file.

In the line 01 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 1D 00 00 00, it’s possible to locate the activation key, but to write it along with the DMU using the HP BCU tool, it requires a different format with the MS Digital Marker. Is there a way to locate this MS Digital Marker key in BIN file or convert it to that format?

Attached is a photo with the detail.

Best Regards,
Vilmar

[adamgouadma]

I noticed there's a lot of unlock request for this model HP EliteBook 640 14 inch G9
The patch won't work if the bios version is latest. use this bin flash both it won't work if you only flash the main you should Flash Both.
first boot press f10 apply factory defaults and restart, 2nd boot reset security settings to defaults and exit.
use BCU and put your original DMI.
frequently asked questions:
can i use this to my HP EliteBook 640 14 inch G9- yes

This is the both BID U75 and U86 its all you need.

Thank you, you are brilliant