I used Australian Consumer Protection laws to get it replaced free of charge. Due to the cost of Apples devices, the law here provides a 2-year warranty irrespective of the supplier's stated period. However, this only applies in Australia and there are many in the Apple Community forums that had to pay Apple to replace the board. Many others reverted to purchasing the BIOS override chip from somewhere that plugs into a socket and costs somewhere less than $100, and others took it to 3rd party to get the existing chip replaced. A lot of the threads are on these forums. I've not seen any instance where Apple agreed that they would repair at their cost for machines out of warranty. Of course, Apple board replacements are refurbished and only have a 3-month warranty. Hence, I simply stopped upgrading at that point because the risk of $700 versus the features being provided did not balance out. I can not get $700 worth of value out of emoticons. So, after suffering this once, the question is, is there value in Big Sur given that it seems to be doing the exact same thing as Catalina? Do I feel lucky? And in current times, if you depend upon your device, can you afford to go without it for a while at a cost of $700.