....... And yes, you  can use an 8gb SD if you wish...but if you have any problems with your  iFly after switching SD cards switch back to the one we provided.   Sandisk is a very high quality card, and cheaper cards can cause  sporadic problems.
-Walter
I will buy a new SanDisk and try. The restricted space makes me break up a major update into too many subgroups. It runs out of temproary memory.