Hey hi had buy and archos arnova 7 4Gb, and i want to root them to install chainfire 3d and play really good games like dead space, bad company 2, etc..

But i don't know how to do, if any one can explain or tutorial,etc.. me

i try universal androot --> Failed! no -- fuu goo.

i try archangel --> Don't response.

z4 mod --> Don't root, restarts device.

I am very precouped i think i return the device to the shop.

Thanks to all

PD:Sorry for my english i'm spanish