Spectra Precision ProFlex 800 Backpack - Manual (Page 17)

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connected or the key does not contain a firmware upgrade,
then the process will abort after a few seconds.
Because data has to be decompressed on the USB key
during upgrades, the USB key must be unlocked, with at
least 100 MBytes of free memory, before starting the
upgrade.
These button combinations are summarized in the table
below:
Button
Combination
ProFlex 800
State
Function
Power+Log+Scroll OFF Restores Factory Settings.
Power+Scroll OFF Initiates firmware update from USB key.