The iPad Pro 3 (12.9-inch, WiFi) comes with a firmware identifier iPad8,5. It has a Board Configuration of J320AP and a Board Platform of t8027. The CPID and BDID are 32807 and 8 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.