Acer V55 System User Manual page 36

BIOS Utility
Most systems are already configured by the manufacturer or the
dealer. There is no need to run Setup when starting the computer
unless you get a Run Setup message.
The Setup program loads configuration values into the battery-backed
nonvolatile memory called CMOS RAM. This memory area is not part
of the system RAM.
If you repeatedly receive Run Setup
messages, the battery may be bad. In this
case, the system cannot retain configuration
values in CMOS. Ask a qualified technician
for assistance.
Before running Setup, make sure that you have saved all open files.
The system reboots immediately after you exit Setup.
BIOS Utility
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