upgrade v1.2 to v1.5 in one step

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    P3 Firmware Updating Phantom 3 Professional V 1.05 from V1.02

    On purchase my P3 Pro was fitted with V1.2.6 and flew successfully for many hours. I decided I needed to increase the SD card to 64 gig. At the same time I decided to upgrade to V1.500.3 as I needed the waypoint facility. So, CLEVER ME!.... tried to do that. I took out the supplied 16Gig...