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In December 2009 a hardware revision of the Acekard 2.1 resulted in what has become as the 'bad batch'

These carts have issues with saving games. On AKAIO 1.5.1 and Official 4.21 the games will work fine until you goto save, at which point the game will freeze. On AKAIO 1.6RC1/RC2 these will freeze while loading the game.

This has been fixed as of Official Firmware 4.22 and AKAIO 1.7.

This issue does not effect the Acekard 2i.