i still don't get how you solder/desolder with what is to all intents and purposes a super hot mini hair dryer?
Super hot air heats up solder, solder melts, remove part. What's not to understand?
I've even used an el-cheapo hot air paint stripper gun to do this before. Consider this, how are you going to get a desoldering iron onto all those BGA pads? You can't, you need a hot air flow to heat up the entire chip until it comes loose. Same for applying a new BGA. Just watch out for temperature sensitive items. I've exploded capacitors and batteries before with the hot air, and the insides of a coin battery do not taste good. :crazy: