If you want to risk bricking the mainboard to try to get the touchpad initialized, change the .bin extension to .fd. Copy to an empty USB stick with an activity LED indicator.

Then with the laptop turned off and plugged in with a fully charged battery, insert the usb stick.

Then press and hold both the FN and ESC keys. While still holding the keys, short press the power button. Release the keys when you see USB LED activity.

If successful, LED activity should continue for about 5 mins then automatically shut down.

You can try to press Ctrl+S to reveal any hidden options in any BIOS tab. It should be in the Main tab if it's hidden.

Then you must decide if the risk of flashing is worth it. If it was mine, I'd try a few other Windows driver tools or Win11 drivers rather than take the risk of bricking an otherwise perfectly functioning system. I don't use touchpads anyway. But it's not mine. So you have to make your own decision.

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It's still possible though slower to navigate an installation without a mouse or touchpad by using certain keyboard keys. For example, tapping the tab key moves the cursor around the installation screen to select or highlight an option. The enter key will then execute the tab selected option.

And, as Billsey implied, certain proprietary Acer Windows drivers (vs generic Windows drivers) can in fact detect & initialize devices even though Windows doesn't. It's much less risky to try different drivers than messing with BIOS mods.

> > I tried both elantech and synaptics drivers. Still the same > >

No. This is the point. These are probably generic Elantech or Synaptic drivers for Win11 or recent Win10 versions.

You see, it's highly unlikely that they are proprietary Acer versions of these drivers in current Windows installers specifically written for these 10+ year old proprietary Acer mainboard designs. Only Win10 has them.

The most recent Acer versions are vintage 2015 for Win10 only. So no new ones have been written & incorporated into Win11 installers & maybe even more recent Win10 installers. Accordingly, I'd have to guess that the Win10 v1511 installer would probably initialize the touchpad but that won't help for Win11.

> >my laptop worked with Win11 too, with no any problems with Acer official drivers, including the touchpad.> >

> >It's custom win11 pro x64 with all bloatware removed. Updates, defender, etc. are all working and the laptop works great 4th month already with no any problems, much better and speedy than win8 or win10.

As mentioned earlier in our discussion, your old mainboard was not listed by Acer as being compatible with the standard Win11 releases. Same with the new board.

Whatever customization was done to make the old board work without any problems, as you seem to claim, means you're trying to install an undocumented or unofficial Win11 modification. So it's hard for us to give you any further guidance other than for you to decide to take the flash risk or try a few other Windows driver tools or Win11 drivers.

Good luck.