What's new in this version?
UNIVERSAL MANUAL REMOTE BACKDATE 2.6
If you have purchased the S1a with the Universal Manual Remote (INTR1B) you will need to backdate your S1 head to 2.6 for your remote to work. This is because we now ship the flash heads with the latest software 2.7 which is incompatible with the Manual Remotes.
Remove the selector knob from the back panel of your flash unit simply by pulling it off. Don't worry, it won't break!