Needed to change a small 56 ball CSP chip. Used my old trick where I make a placement jig of SMD resistors and heat cured epoxy. Then it's easy to remove old chip, wick off old solder, add some flux and drop in a new chip. Soldering with hot air. Epoxy and resistors can be easily removed with tweezers before cleaning the PCB.
wich kind of epoxy dit you use ? and how to solder the new chip ? The step between picture two and three