I thought you couldn't get a residence certificate from immigration until you have done your first 90 days report? It you need the money in the bank before applying for the extension but can't open the account without the residence certificate aren't you in a catch 22 situation?
I'm intrigued, how do you get 2 years out of a one year OA visa? That's the one I'm looking at getting in the future so would be interested to know. I'm assuming it's something to do with leaving the country before the visa expires and then re-entering, is that correct?