Use this guide for installation:
http://gbatemp.net/index.php?showtopic=36554
Simplified installation flow:
1) Download the current software, install U-disk manager on the PC.
2) Plug G6 into PC; It should be detected automatically. Transfer G6 loader (firmware) files onto the cart, plug it into the DS and perform the update. This updates the G6, not the DS.
3) Plug the G6 back into the PC. Use the U-disk manager to transfer some games onto the G6.
4) Put the G6 into the DS and play games.
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