The iPad Pro (M4, 13-inch, Cellular) comes with a firmware identifier iPad16,6. It has a Board Configuration of J721AP and a Board Platform of t8132. The CPID and BDID are 33074 and 14 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.