Double-check your file extension. Sometimes Windows hides file extensions, resulting in a file actually named SCPH1001.bin.bin . Ensure "File name extensions" is checked in your folder view options.
An In-Depth Analysis of the PlayStation BIOS: Exploring the SCPH-1001.BIN File Bios Ps1 Scph1001.bin
for the original North American PlayStation (PSX). Think of it as the console's DNA. It’s the first bit of code that runs when you flip the power switch, responsible for: The Iconic Startup: Double-check your file extension
But inside that grey box lived a tiny ROM chip. On that chip was the (Basic Input/Output System). An In-Depth Analysis of the PlayStation BIOS: Exploring
Note: Some versions of this file found online may actually be a development BIOS (DTL-H1001) with a different MD5: DC2B9BF8DA62EC93E868CFD29F0D067D .
Most modern PS1 emulators (DuckStation, Beetle PSX, Xebra) are capable of using multiple BIOS versions. However, scph1001.bin is the gold standard for several reasons:
You have to dump your own BIOS from a physical PlayStation.