This is terrible... my 3gs 4.3.5 bb 05.16.02. I was successful downgrading to 4.1. I then did the upgrade bb with ipad bb 05.16.00. Now i have NO IMEI BB WIFI ect... Tried restore to 4.1 again didnt work. Try JB didnt work. Anyone knows a solution for this? Is this a hardware prob? Help pls!