HP ProBook 635 Aero G8 bios

[angrej4953]

helo sir pleas fix my hp 845-g8 no display
other bios display ok but endpoint error
SRno. 5CG13449V4

MOD EDIT: Model 635 Aero G8

[hoaca388]

helo sir pleas fix my hp 845-g8 no display
other bios display ok but endpoint error
SRno. 5CG13449V4

HP ProBook 635 Aero G8 Notebook PC (4Q1T0PA)

CPU side

[angrej4953]

HP ProBook 635 Aero G8 Notebook PC (4Q1T0PA)

CPU side

THANKS SIR WORKING

[SMDFlea]

Posts moved to new thread topic,

[wahoo28]

Many thanks in advance for any help!

Motherboard: LANCIA13/Grizzly2.0-6050A3234201-MB-A01 (A1)
HP ProBook 635 Aero G8 (43A03EA#ABU)
S/N 5CG1345RXQ

Salvage laptop with lots of external damage, powered on OK but BIOS-locked.

I desoldered the back chip (a Winbond 25Q256JVEN) and read it twice using a CH341A programmer (same read).

Attempted to do the ActiveNvramRegn clear (there were three or four instances) and programmed on a brand new 25Q256JVEN left from another project (see below).

I was not expecting so many instances of ActiveNvramRegn, I salvaged a very similar 635 Aero G7 in the same way (same front/back chips, similar MB with earlier generation processor) and it only had one instance of ActiveNvramRegn, and the cleared file did unlock the BIOS and recovered it perfectly.


Re-soldered the chip two or three times as no power-on initially (bad contacts, I'm a newbie...), eventually powered on but with endpoint security controller issue and screen flashing, with laptop unresponsive (keyboard inputs not recognised) while screen is off.

It is not a screen issue - I forced HDMI output by unplugging the onboard screen and it is the same thing.

Tried desoldering again, re-programmed the original "locked" file and re-soldered but it has not solved either issue (still having endpoint security and screen flashing).

At this point I don't know if it is a BIOS/EC programming problem or if any other hardware bits have failed - closer inspection revealed some corrosion/possible liquid damage across the board contacts, which I removed with isopropyl and a brush - however, it was powering on fine with all this corrosion before removing the back chip so I don't know...

Also tried using RCUnlocker but it requests a 16mb chip (this motherboard, as far as I can see, only has two 32mb chips front and back exactly like the 635 Aero G7 I salvaged earlier).

Attached are the original files, I detached and read the front BIOS too this time.

[hoaca388]

Many thanks in advance for any help!

Motherboard: LANCIA13/Grizzly2.0-6050A3234201-MB-A01 (A1)
HP ProBook 635 Aero G8 (43A03EA#ABU)
S/N 5CG1345RXQ

Salvage laptop with lots of external damage, powered on OK but BIOS-locked.

Unlocked

[wahoo28]

Unlocked

Thank you so much!!

Just a question, the BIOS now starts up in Manufacturing Program Mode with a counter, do I need to do anything else now?

Also - if it is useful for future reference...
After resoldering both chips, the laptop kept this screen flashing behaviour, however it only did so after the initial HP Wolf Security splash screen. It felt as if there was something hardware-related that intervened _after_ this very initial splash screen was passed.
I disconnected everything from the motherboard (keyboard, touchpad, etc.) and restarted it exclusively with the usb-c connector giving power and connecting mouse, keyboard and screen via docking station.
This configuration did not caused any more screen flashing.

I re-connected the various peripherals one by one - the culprit is most definitely related to the USB-A and audio jack board. I am still not 100% sure if it is the board itself (which had quite a lot of corrosion signs before I cleaned it), the "USB wire cable" (which actually looks fairly intact) or just the ribbon cable "13MB-13USB" that has definitely some ruined tracks. I will try searching for a ribbon cable spare first...

[trungb271]

Hello sir, please help me fix my HP Probook 635 aero G8, HP Endpoint Security Controller Problem
SN: JPH231Lk8S

[lapfix]

Hello sir, please help me fix my HP Probook 635 aero G8, HP Endpoint Security Controller Problem
SN: JPH231Lk8S

post main bios