MacOS Sequoia was released a few days ago which also means that each year, the list of officially supported machines has some of its devices removed and these are no longer able to upgrade or install to the newest version of macOS. A lot of devices that are no longer on the list are still perfectly working Mac hardware, which is more than capable to run the latest macOS version. This post will cover how you can work around these limitations and still install macOS Sequoia on your system even if it is unsupported by Apple.

As is fairly known, an Apple Mac Pro 4,1, also know as the Early 2009 model, is nearly identical to a Mac Pro 5,1, known as a Mid-2010 model. For a long time now it has been possible to flash the firmware or bootROM of a 4,1 to that of the 5,1. Unfortunately it has become harder and harder in 2024 to go through this process due to offline resources and outdates processes. In this article I will cover a workaround and explain step by step what to do in order to flash your Mac Pro 4,1 to a 5,1 today.