The MacBook Pro (M1 Pro, 16-inch, 2021) comes with a firmware identifier MacBookPro18,1. It has a Board Configuration of J316sAP and a Board Platform of t6000. The CPID and BDID are 24576 and 10 respectively.
IPSWDL.COM is a website that provides download links for IPSW files, which are used to install or restore firmware on Apple devices. These files are sourced directly from Apple's servers.