Flashing g2core - synthetos/g2 GitHub Wiki
This page links to various ways to update G2 firmware:
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Flashing g2core with Windows Not longer supported
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Flashing g2core with Atmel Studio and Atmel ICE No Longer Supported
Experimental: If you are on Linux or OSX you can try using the new nodejs flashing utility that is described here. Flashing g2core with OSX