Ledstrip resets but does not turn on

Hello,

My ledstrip was off for a few months without power. I followed the manual steps to reset. The reset should be done by pressing 5 seconds on the button and the leds will start to change colors (red, blue, yellow, purple, pink, etc) then the white light should turn on automatically after the cycle of the colors to sync with app.

The problem is that the white light does not come on and the ledstrip stays off. If I want to turn on the lights i need to do manually.

I hope you help me, Marco