If you are locked out, you may need to remove the CMOS battery from the motherboard for several minutes to reset the memory.
Accessing the BIOS on the Aspire E 15 is standard, but there is a nuance regarding "Fast Boot." acer aspire e 15 bios
Change this to "Function Key" if you want to use F1-F12 without holding the "Fn" button. If you are locked out, you may need
Here is everything you need to know about accessing, navigating, and updating the BIOS on your Acer Aspire E 15. If you are locked out