Agree that you should stick with actual smart contract and not do upgrade anymore.

Actually I think even a centralized crowdsale would have been better in order to avoid any risk linked to smart contract.

Smart contract is a wonderfull technology, but still very young, maybe to collect 12 millions dollars it would have been better to avoid a smart contract...



Besides, could you confirm that we can send ether with ledger nano S? I think it has already been discussed but just want to be 100% sure