hp elitebook 840 g4 need password unlock

[darkpower]

Re: hp elitebook 840 g4 need password unlock

Soldering back the chip can be hard sometimes. In fact got some trouble at the beginning to solder it correctly as there were too many tin on the central attachment of the chip on the motherboard. So first remove as much tin as you can from the center, and add more tin to the leads place, then with hot air, solder it back and it should work.
Regards

[lapfix]

Re: hp elitebook 840 g4 need password unlock

Doesnt work. Caps lock blinking forever.

Re solder the chip carefully , take care if there's resistance near chip
legs

[jaggi_32]

Re: hp elitebook 840 g4 need password unlock

Doesnt work. Caps lock blinking forever.

[black0hackers]

Re: hp elitebook 840 g4

Doesnt work. Blank screen and 5 blinks on power button and caps lock. Checked the soldering, it is soldered well.

here you are!

[jaggi_32]

Re: hp elitebook 840 g4

Doesnt work. Blank screen and 5 blinks on power button and caps lock. Checked the soldering, it is soldered well.

[peste]

Re: hp elitebook 840 g4 need password unlock

Request password unlock for HP Elitebook 840 G4. Attached the BIOS extract. Many thanks!

try..

[jaggi_32]

Re: hp elitebook 840 g4 need password unlock

Request password unlock for HP Elitebook 840 G4. Attached the BIOS extract. Many thanks!

[black0hackers]

Re: Hp 840 g4 bios remove password

post the original bios and EC bios

i dont have it, i need it

[peste]

Re: Hp 840 g4 bios remove password

i need Main and EC bios File 840 g4

post the original bios and EC bios

[black0hackers]

Re: Hp 840 g4 bios remove password

i need Main and EC bios File 840 g4

[darkpower]

Re: hp elitebook 840 g4 need password unlock

good morning is it possible to desolder the chip with soldering iron?

No absolutely not, the chip has no leads, so you absolutely need hot air... You can buy cheap one from china directly, I got one for 22€ delivered to my home.
Good luck

[peste]

Re: hp elitebook 840 g4 need password unlock

good morning is it possible to desolder the chip with soldering iron?

search for videos on the net for this issue.

[gualancho]

Re: hp elitebook 840 g4 need password unlock

good morning is it possible to desolder the chip with soldering iron?

[darkpower]

Re: hp elitebook 840 g4 need password unlock

Steps to flash the bios of elitebook g4 840:
1- Open the laptop
2- Remove the battery then the SSD which is very close to the bios chip
3- protect the surroundings of the bios with aluminium foil or kaptopn tape if you have
4- remove the wson8 packaged bios chip with a heat gun after putting some flux (if you don't have hot air soldering station you cannot do it!!!)
5- connect it to ch341a programmer using twizzers or by soldering it
6- make 2-3 copies of the locked bios and verify each time that the buffer & content of the chip are exactly the same (very important)
7- post the bios on the forum
8- download the unlocked bios
9- Erase the eeprom and write the unlocked bios
10- Solder the bios back on the laptop after applying flux, put more tin on the contacts and remove tin from the central one (this might prevent the pins of the chip to be well connected)
11- put back the laptop battery (5 fast blink and 2 long blinks that I got before means that the chip is not well soldered, the laptop did not find the bios)
12- start the laptop, it should be saying invalid time...
13- enjoy!

[darkpower]

Re: hp elitebook 840 g4 need password unlock

Try this and reply.

Hello, finally it worked well thank you very much
Regards

[darkpower]

Re: hp elitebook 840 g4 need password unlock

Hello, yes I posted the original bios from my computer not the one I downloaded from the site...
Regards

[peste]

Re: hp elitebook 840 g4 need password unlock

Hello thanks for prompt bios sending...
Same problem, red flashing 5 times (fast) then green bkinks one time (slow blink). Could be some other issue? is it possible that I installed wrongly the chip (I'm sure I installed in the good position as it was before)?
Thanks

post the original bios not the one you tried on the site.

[darkpower]

Re: hp elitebook 840 g4 need password unlock

Hello thanks for prompt bios sending...
Same problem, red flashing 5 times (fast) then green bkinks one time (slow blink). Could be some other issue? is it possible that I installed wrongly the chip (I'm sure I installed in the good position as it was before)?
Thanks

[peste]

Re: hp elitebook 840 g4 need password unlock

Hello,
I have a password locked (limited lock) cannot update bios... I tried one of the bios submitted in this forum but did not work (motherboard blinking once I put in the bios), here is my password protected bios, can you please unlock it and give me one that works?
Thanks guys

try..

[darkpower]

Re: hp elitebook 840 g4 need password unlock

Hello,
I have a password locked (limited lock) cannot update bios... I tried one of the bios submitted in this forum but did not work (motherboard blinking once I put in the bios), here is my password protected bios, can you please unlock it and give me one that works?
Thanks guys