Even though performance tests of SanDisk Ultra 1TB and SanDisk Extreme Pro 1TB SD cards conducted by the F3 would produce “OK” results, it was discovered that data would not be properly saved on these cards during audio recording.
We apologize for any inconvenience. Please use microSDHC/SDXC cards on the most recent list of microSDHC/SDXC cards that have been confirmed for operation with this unit.