While you have an AN515-43, the specific sub-model (found on a sticker on the bottom of the laptop, e.g., AN515-43-R0HM) determines which BIOS file you need. Using the wrong region's BIOS can cause issues.
: Version 1.12 is the most recent official release reported. update bios acer nitro 5 an51543 link
If you tell me what specific problem you are trying to solve by updating your BIOS (e.g., system instability, fan control, or hardware recognition), I can help you determine if a BIOS update is the correct solution or provide alternative troubleshooting steps. How to Update the BIOS on an Acer Nitro While you have an AN515-43, the specific sub-model