Resetting a mAP lite

Hello,

regardless what I do, instead of resetting the mAP lite goes directly to CAPs mode.

I hold the button during boot process for less than 5 seconds (as suggested in the manual - however “LED light starts flashing” is a little bit vague, which LED?).

I checked this with a clock, too.

What can I do, to get the mAP lite resetted to factory settings?