If you see a “Secure Boot fail” prompt, then you must have some related security settings that haven’t been disabled. Go into the BIOS and look carefully.
You did not include the detailed configuration of your device in your message. According to ChatGPT’s research about the Acer Aspire 3 series, these laptops often have some specific BIOS/UEFI security behaviors that can cause a “Security Boot Fail” message even when users believe Secure Boot has already been disabled.
On many Acer Aspire 3 devices, Secure Boot cannot actually be fully disabled unless a Supervisor Password is first set in the BIOS. Without this password, the option may appear changeable, but the system may still enforce Secure Boot.
Please try the following steps:
Reboot the device and press F2 to enter the BIOS.
Go to the Security tab.
Set a Supervisor Password .
After setting the password, change Secure Boot to Disabled.
Make sure Boot Mode is set to UEFI .
Disable Fast Boot if it is enabled.
Save the settings and reboot.
Since relatively few users have the exact same device as yours, providing more BIOS screenshots will help us understand the settings better. You may also try using AI tools such as ChatGPT to search for similar cases, which can sometimes help you find solutions more quickly.