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January 18, 2015 at 4:39 pm #1232
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I went the alternate route and updated mine using a Teensy 3.1 (which runs at 3.3v) and ArduinoISP :).

Teensy programming uRADMonitor

If anyone else has a 3.3v Arduino (or clone) and wants to give it a go I’ve put some details of the process on my blog.