Re: hp elitebook 840 g4 need password unlock
Hello,
Unfortunately, each bios in those laptops is unique, so no, you cannot expedite the process. The only way of accelerating process is to have the password, which I guess is impossible, but worth asking... Hopefull the one that sold you the laptops have the password, or can ask the password from the enterprises he gets them from.
A way to accelerate things though, is to remove the password yourself from the files, which is possible, by removing some binary data and replacing it by 0xFF or 0x00...
darkpower
Member
Last Activity: 03-30-2021, 02:31 AM
Joined: 10-30-2019
Location: paris
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Re: hp elitebook 840 g4 need password unlock
Yes that's the point, with ch341a, you should read & save your locked firmware, post it here, and the community will repost a firmware without password. Download it and reprogram it. Then solder it back (so yeah you will need to remove the chip from motherboard before).
Regards...Leave a comment:
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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.
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Re: hp elitebook 840 g4 need password unlock
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.
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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...Last edited by darkpower; 08-03-2020, 03:11 AM.Leave a comment:
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Re: hp elitebook 840 g4 need password unlock
Hello, finally it worked well thank you very much
Regards...Leave a comment:
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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...
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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)?
ThanksLast edited by darkpower; 07-31-2020, 09:43 AM.Leave a comment:
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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 guysLast edited by SMDFlea; 04-10-2023, 12:39 PM.Leave a comment:
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Re: hp elitebook 840 g4 need password unlock
Hello Vesko356,
I'm actually afraid of breaking something on the mother board or something like that, do you have some advices/tutorials/other instructions to give me sothat I do it as safely as possible?
ThanksLeave a comment:
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Re: hp elitebook 840 g4 need password unlock
Thank you guys for your help.
Regards...Leave a comment:
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Re: hp elitebook 840 g4 need password unlock
Hello @zenek_19,
Did you remove the eeprom or is there any way to reprogram or without removing it? Please help me.
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Re: hp elitebook 840 g4 need password unlock
Hello,
I tried to put a testing clamp on the bios socket, but did not work. The bios uses a Winbond 25Q128JVPQ and it has no leads. How did you do guys to reprogram it? Any help would be appreciated.
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