@DPIN Guess what, Garmin just released firmware 4.00 for the D2 Delta series. Could you please update to that and once it's updated, please power off the watch. Then hold the top right button ("Direct to"/"D2") and switch it on with the Power button, but KEEP HOLDING the D2-button. It should show the blue triangle but not boot up as long as you keep pressing the D2-button. Once you release the button, it should boot up normally.

Please, tell me if that works on the D2 with V4.00.