Yes you can update to the latest firmware in one hit.
But you need to use the old Profilux software to do the update.
And then you can install the new GCC which you will require after the firmware
update.
If you have never done an firmware update, I recommend you go the the GHL forum and search for firmware update and read it thourougly. A lot of people get it wrong and it makes it much harder to update after a failure.
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