Hi Robert,
It would not install FROM a blank SD card (Sandisk 8GB Extreme III 30MG ) with only the new 5.7 update so I copied the update onto another SD card (same as the first) with all my HB folders,= Matrix, Record, ProfileTXT and Snapshot...... Inserted SD card into HB and immediately installed with no apparent problems. Powered the unit off removed the SD card . Powered HB back on again restored the defaults, then went about changing to my personal settings in forced simulator mode after another power off/on. There does not appear to be any fault with the first SD card. The whole deal took place "on bench".
Geoff