Tried your latest zip, now the laptop doesnt work anymore. Only two leds and black screen.
@Sweet_Kitten
Windows key + B not working with usb recovery… https://support.hp.com/us-en/document/c02693833
The BIOS was flashed, but, as it turned out, it was not permissible to do this in this way. Create USB recovery key and restore the device to work(didn’t work?!).
Until recently, I did not want to change the BIOS file(.bin). And it looks like this is the only safe way to rollback. To prevent the the error "Bios Verify Signature Not Succeed (Incompatible Version)", I will have to change the version of the .bin file.
@Sweet_Kitten
Will the latest BIOS version Usb recovery key work on the current flashed bios (older)?
It should.
It should.
@Sweet_Kitten
yeeeees it’s recovering with the latest version I have installed… oh my god !! (I disconnected the batter and I press power button about 30 seconds before I tried the USB recovery utility)
Well, what can we do more?
Will I be able to recover the laptop if I have another problem flashing?
I start changing the BIOS in order to fake its version and so that it can be flashed in the shell.
Yes.
Recovery finished, I have black screen again 
when it was working the screen was ON… what’s happening now¿?
I have two leds and black screen, maybe I need to remove the USB and press power button 4 seconods?¿
I remember the last screen I have seen was something like “installing boot blocks 99%”
@Sweet_Kitten
Edit Maybe I need to recover using older bios?
Don’t know. Maybe the error is still stored in the CMOS memory. It is worth turning off the device and holding the power button for about a minute.
It will not improve the situation.
Edited: removed log file
@Sweet_Kitten
what do you think ? I have the cmos removed and also tried pressing power button 30 seconds
I’m gonna try with:
Reset the CMOS
This only applies to consumer notebooks.
In some cases the automatic BIOS recovery fails because of corrupted CMOS (Complementary Metal Oxide Semiconductor) data. The CMOS stores BIOS settings. Try this procedure to reset the CMOS and recover the BIOS.
Turn off the computer.
Press and hold the Windows + V keys.
Still pressing those keys, press and hold the Power button on the computer for 2-3 seconds, and then release the Power button, but continue pressing and holding the Windows + V keys until the CMOS Reset screen displays or you hear beeping sounds.
At the completion of a successful CMOS Reset, a message similar to the one below displays:
Successful CMOS reset button message
Press Enter to restart the computer.
from https://support.hp.com/us-en/document/c02693833
it’s working right now !
@Sweeet Kitten wow !!! current BIOS VERSION installed is F.03 !!!
do you think this is true? or maybe it’s only the version name/number changed… ??
it’s strange cause I used latest bios for the recovery… what do you think?
No. This cannot be. Your BIOS version is now actually F.03.
@Sweet_Kitten
If I want to use another BIOS version with the latest .zip you send me, will I need to change only .bin and .s12 files? or I will need to change some more files?
Just to know… cause I’m gonna do some tests with Spectre and Meltdown
One off-topic question: I have another water damaged motherboard (same laptop and motherboard), I tried cleaning it with alcohol but nothing it only shows two leds and black screen. I bough it on ebay, do you think it’s possible to recover it? The screen flashes 1 second when I turn it on and then black screen. Do you think it’s only water damaged or can be a bios problem?
Were s12 in my archive at all? Just .bin 
It is a BIOS problem only if the caps lock shows 2 or 6 leds.
Thanks
@Sweet_Kitten
Another question, do you know which versions of these Bios are the best?
Or at least If spectre/meltdown patched are included in the latest bios from the official hp link?
I’m currently using NVME SSD in wifi port and I want to know if I/O and performance is affected due to spectre bios in newer bios…
Currently I think it’s working faster right now with the oldest bios but I don’t know if it’s a placebo haha
Anyway LOT OF THANKS for help me, if you need some w10 tweaks or I can help you in something I will be pleased.
Were s12 in my archive at all? Just .bin
ok, so replacing .bin with different version will work if I then recover the bios using latest bios ¿?
It is a BIOS problem only if the caps lock shows 2 or 6 leds.
the screen flashes 1 second and then black screen with power led and another led which is charging or powered led depending if battery is removed or not
Here in “Revision history” you can see the fixes related to all bios:
https://support.hp.com/us-en/drivers/sel…mId/ob-255012-1
sure these " Provides improved security." are related to spectre… but I don’t know
anyway there isn’t a lot of info about each bios update…
I’m sorry, I can’t know.
It depends on the microcode. It is likely that these vulnerabilities were patched in the latest BIOS versions. Since reverse engineering is difficult and I’m not sure if I can find information on this or that version of mCode, I can’t say. It will be easier if you check the performance on each BIOS one by one.
Perhaps, it is waterdamaged.
HOWTO Rollback to an Older HP Insyde BIOS.
Software method. Prerequisites and basic steps.
1. Prerequisites.
If you are an INTEL user.
In general: the thing is that you need a BIOS update SP (SoftPaq), or a specially formatted small BIOS file from it.
If you want to rollback to a previous BIOS version, you need to obtain a BIOS file from official source.-NO any signature needed for downgrade if the process of updating your BIOS was meant by launching Windows executable. If you have one, it almost doubles your chances.
If you are an AMD user.
In general: the main thing is the BIOS update binary file you'd want to rollback to.
Obtain a BIOS file. It doesn't matter where it was taken, what extension it has and if it is encrypted or not. It just needs to be compatible to your device.-NO any signature needed for downgrade if the process of updating your BIOS was meant by launching Windows executable. If you have one, it almost doubles your chances.
2. Steps.
In general: UEFI flashing or Legacy flashing.
A) Spoof BIOS version (UEFI).
Signature file is required! It can be extracted using the hewprsa included in the PHOENIX TOOL functionality. If you can't extract it or don't have it, go to method B.As paddings in the BIOS structure are not protected by encryption, you can freely change the BIOS version without affecting the RSA signature. And all that needs to be done with the bios file is to increase the hexadecimal value of its version after the letter "F" higher than the currently installed version.
Once saved move edited BIOS file along with signature to the folder named "New" in created partition.Perform the UEFI flashing process by pressing Win+B key combo.
Can be done using H2OEZE or by locating next to "$bvdt" string using UEFITool.
B) Patching flashing mode (Legacy).
This is the more complicated way to rollback, but more effecient too. Get a "InsydeFlash" aka "HPFlashWin" program compatible with your device. If you cannot - make a request. To proceed, you should have not only good computer skills, but also some experience in assembly. If you have not - make a request.While editing InsydeFlash.exe and iscflashx32/64.dll make sure that you avoided these types of checks from being potentially executed: "The BIOS image is corrupted or does not contain the correct digital signature" and "Boot block cannot support to downgrade".
Open "platform.ini" and set value "FFF" to "AllowVersion" parameter.
What's more, there are the tested patches for the two most common patterns of choose function between UEFI and Legacy flashing modes that you need to apply if you still can't rollback.
3. Tips.
An abdication of responsibility and more.
Although I think that it is impossible to harm the device by doing this, I won't accept my responsibility for any kind of malfunction caused by your actions or occasionally. I recommend not trying anything described here unless absolutely necessary.In the UEFI shell method, the support enviroment programs may not support all BIOSes, and the key combination may differ.
With regard to patching libraries, this information is provided for educational purposes and is not a real guide to action. It only determines what options for BIOS rollback are.
@Sweet_Kitten
May you send me a BIOS dump so I can see what hidden options are in bios and use with setup_var in efi shell ?
I want to check Intel DPTF ( Intel Dynamic Platform Thermal Framework )
thanks!