Bios for 15-ac004nl & error 500

[Davidxxx123]

My HP 15-ac004nl laptop shows a blinking Caps Lock light when I power it on.

I believe I need to recover the BIOS using a USB key, but I can't find the latest official BIOS file. i dowloaded the file as per this post: Bios for 15-ac004nl - HP Support Community - 9472236 with a Bios: https://ftp.hp.com/pub/softpaq/sp96501-97000/sp96831.exe but i obtain Error 500 at end of the process. what's wrong? how i can fix?

[tk_srq]

@Davidxxx123

SP 96831(F.29) you just tried is a newest BIOS file for your model.

The '500' error is a BIOS recovery error. I don't know what went wrong with your BIOS recovery attempt.

My suggestion: try a hard reset to clear the memory. Click the link below for how to do it. Then try a BIOS recovery with the F.29 file.

HP PCs - How to power reset your computer | HP® Support

If you still have the issue, try older BIOS versions shown below.

F.28

https://ftp.hp.com/pub/softpaq/sp93001-93500/sp93116.exe

https://ftp.hp.com/pub/softpaq/sp93001-93500/sp93116.html

F.27

https://ftp.hp.com/pub/softpaq/sp88501-89000/sp88923.exe

https://ftp.hp.com/pub/softpaq/sp88501-89000/sp88923.html

[Davidxxx123]

@tk_srq i tried to use the older BIOS but the system says that the bios is blocked with the machine. what i can use then? my Notebook HP - 15-ac004nl - M3Y78EA

[tk_srq]

Release notes for sp96831 (F.29) state that it supersedes sp 93116 (F.28), and F.28 release notes say F.28 supersedes F.27. I thought those older versions would be compatible with your model.

https://ftp.hp.com/pub/softpaq/sp96501-97000/sp96831.html

Below is the link to an HP BIOS recovery,

HP Notebook PCs - Recovering the BIOS (Basic Input Output System) | HP® Support

If you already tried a power reset, try a CMOS reset.

If this doesn't work and you already attempted a BIOS recovery in a way that is described in the above document, my only other suggestion is to remove a residual charge off of the motherboard completely and try a BIOS update again. To do this you need to remove the charger and external battery, open the case, remove a CMOS battery and press the power button to drain a residual charge.

This may be a lot of work for you and the fix is not guaranteed. Your other options would be to have a computer repair shop reflash the BIOS or replace the motherboard, but either option may be expensive and may not be cost effective, as your notebook is an older model.

If you want to open the case, let me know and I can find a service manual for you.