it is not totally clear to me , i have an ethereumwallet which holds a nice amount of ethereum and other tokens but that is also the wallet which holds the minereum and i don't like to put the wallet online, is it possible to upgrade to level 3 without putting my wallet in danger?
Your eth or other tokens are never in danger when you use the v2 platform.
The platform never has access to your private keys, other tokens or ether.
All the eth amounts you transfer to the platform popup for you to confirm first