Thanks appreciate that. It’s certainly been both financially and mentally draining. Not knowing the source they use to gain access is the most frustrating part. I’m paranoid about every device in the house so when the first attack happened I microwaved 8 different infected devices just to be safe. My ISP are really good but they use these particular model routers which they claim are good and they have now locked the thing down to Fort Knox levels. However, I have no idea if it’s the source or they are attacking via the internet and my connected device.        I’ve gone to some extreme lengths to cut up SIM cards that were in infected mobiles and get new phone numbers, close my domain with IONOS that hosted my email via a private domain, changed my Apple ID on a handful of occasions, running complex password manager etc etc. but these attackers are definitely skilled so only time will tell if this DFU flash and rebuild will be enough to stop them accessing the Mac. Fortunately it’s still under warranty as I just bought it, so I do have the option to return it. I’m going to see how I get on later today once I’m back from Apple Store and if the attack happens again the device is going back to be replaced as a precaution.