Download the latest iOS IPSW for the iPhone 12 Pro Max (iPhone13,4). Since this is the latest iOS IPSW firmware file for the iPhone13,4, it is still being signed by Apple and can be restored with iTunes or 3utools.
This firmware file will be updated automatically so that you get to download only the latest signed version anytime you visit this page.
About the iPhone 12 Pro Max
The iPhone 12 Pro Max is Apple's most ambitious iPhone yet and naturally commands a steep premium too. In my iPhone 12 Pro review, I mentioned that even though the smaller Pro model is a superb offering, it's probably not the smartest choice. If you are thinking of going all-out on your iPhone purchase this year, then you should probably look at spending a bit more and getting the iPhone 12 Pro Max instead. After using it for a week, I think I was right in making that assumption.
You can find detailed specs and news about this device here.