Default Arnova 101 g4 - Freeze no boot

Hi ,

i'm a french owner of a Arnova tab, model 101 g4:

.ldlc.com/fiche/PB00152581.html

a low cost tab, but it makes the job until yesterday...

it requested an update, then wifi function was completely unavailable, so i tried an update from arnova website, and the provided firmware completely ****s my tablet,

now it doesn't look alive, just the screen who's "lightning"


What can i try? does i have any method to reset this tab? other than the "arnova method" or sending it by mail...

sorry for my english, thanks in advance,