goto options and goto last scroll on bottom off system update and click it when your done the games will still be in the shop for free and you can download it any time you want.
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The DSi Internet Browser can be downloaded for free from the Nintendo DSi shop.
Should be pre-installed on system. If not, can be downloaded from Nintendo DSi Shop.
No, Nintendo's updates block Flash carts ther not going to let you use an old firmware.
System settings > data management > click on the title you wanna delete > delete
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