While you can still download the specific firmware for your iPad Air 4 (Cellular) Go to product viewer dialog for this item.
If you still wish to download the firmware for archival or technical purposes, here are the details: : iPad_Fall_2020_15.6_19G71_Restore.ipsw . Device Identifier : iPad13,2 (specifically for the iPad Air 4 Wi-Fi + Cellular Download iOS 15.6 for iPad Air 4 (Cellular)
If you were installing a signed version of iPadOS (like the current version), the process for using an IPSW file is as follows: While you can still download the specific firmware
: You can also find the slightly newer iPadOS 15.6.1 , which was also released in August 2022 and is similarly unsigned. Standard Installation Steps (For Signed Versions) Standard Installation Steps (For Signed Versions) , Apple
, Apple has this version. This means that while the file is available, you generally cannot install it on your device through official methods like iTunes or Finder, as Apple’s servers will reject the installation request. If you are looking to purchase an iPad Air 4 Go to product viewer dialog for this item.