Mac address conflict on sonoff R2 device

[MrX999]

PROBLEM DESCRIPTION

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I have two sonoff R2 devices that now have a conflict and won't connect to the MQTT broker at the same time. After doing a bit of digging I realised that everything works when you disable the MQTT on either device. I then noticed that they bought have the same Mac address. I have only ever used tasmotizer locally or downloaded directly from the Tasmota web downloader. Never compiled or connect to Arduino etc. recently I replaced one with the backup of the other and stopped using the original. Now that I'm using the original with new setup I noticed the issue with the Mac address. Any idea what to do now? Is one of these now for the bin?

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