The iPad Air 13-inch (M3) comes with a firmware identifier iPad15,6. It has a Board Configuration of J638AP and a Board Platform of t8122. The CPID and BDID are 33058 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.