1.5, 1.6, 1.7...do you have all those FW versions?...There is a certain amount of brick risk in doing FW updates. I'd recommend just do the 1.8 update if you absolutely need what's been added since 1.4...I updated to 1.8 direct from 1.4 because of the added bind encryption. Some GO app settings got reset to default. The bird seems more twitchy in wind gust as before it's just parked in the sky.