mindEraser0>>>The original factory-installed Windows version was 8. It was replaced with Windows 10 immediately.>>>April could be a possibility. >>>

Yeah, some of the major Win10 updates have messed with the EFI partitions that UEFI bootstrap security depends on. But it shouldn't have interfered with or corrupted the bootstrap firmware to the extent that F2 won't work if you're fast enough.

So I think we should give the F2 thing one last shot. Remove the charger. Gently insert a paperclip into the battery reset pinhole on the bottom for 30 seconds to make sure it's completely powered off except for the CMOS coin cell on the mainboard. Then reconnect the charger. Then start rapidly tapping the F2 key even before hitting the power button. While continuing to rapidly mash the F2 key, hit the power button.

If still no joy in getting into the BIOS menu, then I think we gotta try to boot the machine from a generic Win10 USB installation stick.  Is that how you originally installed Win10? If not, you're gonna have to make a generic Win10 installation bootstick using this media creation tool
https://www.microsoft.com/en-us/software-download/windows10 .

I know you probably don't want to hear this, but if it was my machine, I'd try to upgrade back to Win8.x ASAP either using the generic Win8.x installation stick for free https://www.microsoft.com/en-us/software-download/windows8ISO or the ACER-specific Win8x from the ACER store https://store.acer.com/en-us/extended/recovery/ for about $46 . My reason is because major Win10updates are rapidfire, heavyhanded & typically only supported for 18mos or less. That means even if you successfully installed and got your machine to work on the latest v1809 , its maintenance support ends April 2020. Nearly three years BEFORE Win8.x support ends.  Such is the new and unimproved Microsoft lifecycle policies https://support.microsoft.com/en-us/help/13853/windows-lifecycle-fact-sheet

Because of this new lifecycle policy, my two factory-installed Win10 machines are now dual boot and default to a Mint 18.3 Cinammon GUI that's setup with the same look, feel & operation of Win7, Microsoft's last halfway decent system IMO. And Mint is faster and more stable than Win10. And with apps like its native Libre Office suite, I can do at least as much as the latest MS equivalents including compatibility therewith. I think the status quo in PC GUIs will be broken before 2020 if this new policy remains unchanged.

Jack E/NJ

PS: Try Jordan's suggestions too if you wanna try to remove the drives.

The Ubuntu iso bootstick must be created with GPT-partitioning via Rufus or UEFI bootstrapper won't see it. I suggest trying what Jordan suggested if my earlier 'last shot' of getting into the BIOS menu didn't work.

I agree Win8 was bad. But if you can get Win8.1 on the machine, it's not quite as bad. And you shouldn't have the update issues that plague Win10 especially with each new major Win10 update release almost like a new Windows version. 1809 would probably be called Windows16 or service pack #6 under the old Windows naming conventions. Win10 is a moving target even for machines that are less than a year old.

Even if you can't get Win8x back on the machine, you might want to try to follow some of the steps for getting a ubuntu-flavored distribution installed here https://community.acer.com/en/discussion/comment/598047/#Comment_598047

Jack E/NJ     

OK. Good luck. Jack E/NJ