actually it works after upgrade to recent FWs , 2.4.65 at least
i found that putting Archos connected to PC via USB, or just plugged to the charger, then restart device - it somehow manage to root the device
Currently i cannot show this anymore, because i wiped my device , but i think that it was possible because i have installed Archangel on 2.1.08 and after that i only applied upgrades
I even suspect that Archangel was somehow "guilty" and didn't allow me to upgrade to latest 2.4.80 (it always fail on "checking update file validity" with msg :
Sorry, an unexpected error occured (code 112))