Turn on the calculator
Press the `2nd` key
Press the `+` key to open `MEM`
Select `7:Reset`
Choose `1:All RAM` to clear memory and reset settings
Press `2:Reset` to confirm
Wait for the calculator to restart
For a full reset, choose `2:All Memory`
Press `2:Reset` again to confirm
If needed, remove and reinsert the batteries after resetting