I've got an Android phone with Greenaddress on it, that I've been effectively using as cold storage. I've now put it online to get my BTC off it, and when I try the transaction (using a legacy address) it goes through two factor authentication, but when I enter the code it just says
client too old!
There's no Greenaddress to update to on the Play store, so I tried installing 'Green' as it's by the same people, but it says there's no wallet!
EDIT: worse still, most of it is gone! Was it compromised?!! What can I do?