There isn't one single "official" extractor; instead, several community-trusted tools and manual methods are used: 7-Zip or WinRAR
Your only hope is a hardware SPI flash programmer. But when you search online for a BIOS dump for your specific model (e.g., Acer Nitro AN515-54), you find nothing, or you find a file uploaded by a stranger on a Russian forum—a dicey security proposition. acer bios extractor tool
A specialized tool designed for Acer/InsydeFlash files, allowing you to drag and drop the ...EXE update file to extract the firmware. There isn't one single "official" extractor