Re: HP Probook 4540s - BIOS

This is a list of common HP blink codes. Please note that it doesn't cover all cases of malfunction....

Re: HP Probook 4540s - BIOS

Hello @peste,
I was on a business trip this week but yesterday when I came back home I had the opportunity to disassemble the laptop and flash the BIOS chip with your latest fixed BIOS image. The laptop booted up and now works like a charm! I couldn't have done it without your help.
Many thanks for all you have done! God bless you, man!!!

P.S.: I still have no explanation why the laptop didn't work with your first fix after I unsuccessfully updated the BIOS and then started to work with your second fix. Anyway, all's well that...

Re: HP Probook 4540s - BIOS

Hello @peste,
I ordered new CH341A programmer and compared again the contents of the BIOS chip to the BIOS image you sent me (the one that worked for me before I apply the BIOS update.) I compared bin files read by my previous two programmers and as well as with the new one. I also used AsProgrammer 1.4, CH341A Progammer 1.0, and CH341A Programmer 1.4. That means 9 files read in Windows and 3 files read in Linux (using my 3 programmers with flashrom utility.) All 12 files are exactly the same to your bin file. But still the laptop cannot run....

Re: HP Probook 4540s - BIOS



Hello @peste,
I flashed the chip twice with your bin file (that worked before.) I used two different CH341A programmers, first time I did it under Linux, second time under Windows. And each time I write the image to the chip, I then read it twice and compare with the original file. So I ended up with four read bin files that are exactly the same as the original bin file. So I'm pretty sure that the chip contains your bin image.
I have no explanation why this time the laptop cannot boot. That's why I uploaded the last image...

Re: HP Probook 4540s - BIOS

Hello @peste, would you help me once again? I made a mistake to update the BIOS by using HP utility and the laptop died again after trying to reboot.
I flashed the BIOS chip with the bin image you made for me and which worked before. Unfortunately this didn't help. I ended up again with blank screen, Caps Lock constantly blinking and fan spinning few seconds after power on. I attached a BIOS image as it was after the disastrous update, i.e. before flashing the chip again with your image. Thanks in advance for any help provided!...

Re: HP ProBook 4540s - Corrupted BIOS



Thank you very much, @peste!!! Today I was able to reprogram the W25Q64FVSIG chip by using your fixed BIOS image. The laptop is back to life! I didn't believe my eyes!

Many, many, many thanks!!!

God bless you!!!...

Re: HP ProBook 4540s - Corrupted BIOS

Thank you very much for the quick response!
I will try this image later on today or tomorrow and I'll let you know of the results.

HP ProBook 4540s - Corrupted BIOS

Hello everyone,
I need help with my HP ProBook 4540s BIOS. For some time I have a problem with the BIOS of my HP ProBook 4540s laptop: once or twice a year the laptop does not boot (black screen, fan spins, Caps Lock blinks continuously.) Each time this happens, after several restarts I manage to enter either into the BIOS or in Windows and then I'm able to update (flash) the BIOS by using the 'HP BIOS Update and Recovery' utility.
Half a year ago, the CMOS battery died, and after I replaced it, the laptop no longer wants to start...