2

i have a Acer Aspire 5 A515-44 with Windows 10 Pre-installed , but I need for my Car Diagnostic Programs Windows 7. So I decided to work with a Virtual Machine installed Win 7 but the programs won't work and my Car Program Devices won't connect to Win 10 so it doesn't even show up on the Virtual Machine... anyways ,the next option was to install Windows 7 on my second ssd but I can't change from UEFI to Legacy Support or any other options. Boot Mode UEFI is greyed out so I can't even look if there is any other options avaible. Disable Secure Boot doesn't help and I really don't know what to do?? Never had this problem before.

Edit: Installing Windows 7 with Secure Boot Disabled gives me an error in Windows Boot Manager, Error: 0xc00000d

  • Acer Aspire 5 A515-44 (AMD) -
Caro
  • 21

2 Answers2

2

According to the post How to enable Legacy Boot on Aspire A515-54, the solution is to install the latest BIOS version.

You may download the BIOS from Acer at Download Acer support drivers.

harrymc
  • 498,455
0

Uefiseven and other hacks are all fine and dandy to workaround official Windows limitations, but alas they still aren't perfect. So for the sake of the argument let's just say that you need to boot a UEFI-less OS (and on bare metal, because of whatever reason).

Of course you need the services provided by CSM.

Now, there's this voice that Intel >2020 systems got it gutted for good (depends on who you ask) but I could tell you my 2021 Comet Lake AN515-55 could still be made to reason with it.

And I just checked one old bios version for your laptop and I found drivers named "BiosVideoDxe", "LegacyBiosDxe" and "LegacyBiosPlatformHookDxe", so I would expect the thing still to work if you just could toggle the setting (there are also examples from other vendors of Renoir still supporting legacy boot).

If you are extremely lucky, you already mentioned having disabled secure boot.. you can just try to disable fast boot, modern standby, or any SATA mode that isn't AHCI (remember the option only comes out with the CTRL + S combo). And then perhaps it will become selectable.

Otherwise, I'm afraid it becomes an increasingly harder game of taking guesses. Maybe you can get some of the advanced menu codes to work, and everything unlocks by itself. Possibly you can play with your UEFI variables (the Boot Mode value is set inside the SystemConfig store, which should correspond to the Setup namespace with guid A04A27F4-DF00-4D42-B552-39511302113D).

Or last but not least you can mod your bios. But it's probably gonna be write protected, and on AMD systems there are apparently no workarounds. So you are gonna need a hardware flasher, on top of the usual mess that it already would entail.

mirh
  • 1,172