HP Elitebook 840 G2

[musanide]

Re: HP Elitebook 840 G2

Thank you very much this forum is very helpful

[lucian6464]

Re: HP Elitebook 840 G2: Flash BIOS to clean password

Hi, I'm trying to write a new bios to a Hp Elite Book G2. I have a CH341A usb interface but I cannot write. It erases the chip in 1 sec but when i try to blank error straight.
I'm using CH341A Programmer v1.34
Any suggestions ?

[lucian6464]

Re: HP Elitebook 840 G2: Flash BIOS to clean password

This is the error (Chip main memory are not null )

[peste]

Re: HP Elitebook 840 G2: Flash BIOS to clean password

This is the error (Chip main memory are not null )

use this program and remove the bios chip from the board before reading or writing.

https://www.badcaps.net/forum/showpo...6&postcount=10

[lucian6464]

Re: HP Elitebook 840 G2: Flash BIOS to clean password

Thank you, i will try today

[lordgeny]

EliteBook 840 g2

EliteBook 840 g2
u365 is mx25l12873
u366 is 26q16dvsig

looking for good bios , i post my dump

[peste]

Re: EliteBook 840 g2

EliteBook 840 g2
u365 is mx25l12873
u366 is 26q16dvsig

looking for good bios , i post my dump

try..

[lordgeny]

Re: EliteBook 840 g2

this are for bios ?

[peste]

Re: EliteBook 840 g2

this are for bios ?

yes, just write the 16MB chip, the other one stays the same ..

[alosm]

Re: HP Elitebook 840 G2

Hello! please help, HP elitebook 840 G2,the machine starts, fan rotates at full speed and the screen is black,password lock .

[grego123]

Re: HP Elitebook 840 G2

Hi guys,
I am currently trying to get the BIOS dump for an Elitebook 840 from a CH341A + SOIC8 clip with AsProgrammer 1.4.1
I have identify 2 chips, a Macronix MX25L12873 and a WINBOND 25Q16DV

I saw in previous messages that the Macronix is the main BIOS chip. Can you confirm?

When I read this one, I obtain a 16Mb file but only FFFFFF in it.

The CMOS battery is still there. Should I remove it?

Any other suggestion? Thanks for you help

Grego

[SMDFlea]

Re: HP Elitebook 840 G2

suggestion - https://www.badcaps.net/forum/showpo...6&postcount=51

[alosm]

Re: HP Elitebook 840 G2

Hi guys,
Question,
The bios from the site is 10 MB and the dump is 16 MB how to build a new bios? what do you have to lose from the old one? where to upload new to old?

[peste]

Re: HP Elitebook 840 G2

Hi guys,
Question,
The bios from the site is 10 MB and the dump is 16 MB how to build a new bios? what do you have to lose from the old one? where to upload new to old?

try the bios from post # 64 ...

[grego123]

Re: HP Elitebook 840 G2

suggestion - https://www.badcaps.net/forum/showpo...6&postcount=51

Thanks for the suggestion.
So I removed the battery, plugged the charger and turn on the laptop.
Screen remains black and fan turn at high speed
(same if I put back the battery)
Reading the chip still brings FFFF only

Should I try to erase the BIOS chip and replace by one such as the one post#64 or it is a bad idea?

[alosm]

Re: HP Elitebook 840 G2

try the bios from post # 64 ...

The machine starts, fan rotates at full speed and the screen is black

[alosm]

Re: HP Elitebook 840 G2

the machine starts, fan rotates at full speed and the screen is black

[peste]

Re: HP Elitebook 840 G2

the machine starts, fan rotates at full speed and the screen is black

post the motherboard model.

[alosm]

Re: HP Elitebook 840 G2

post the motherboard model.

I have such a message "Warning machine is not in committed state"
System Board CT PEVMN00WB241HU

[alosm]

Re: HP Elitebook 840 G2

I have such a message "Warning machine is not in committed state"
System Board CT PEVMN00WB241HU

I uploaded the file that I glued from the original one from the website + hp840g2_lock_12042021.bin, after uploading I have a message as above