Question about Alpine Ezi-Dab-Bt

Works fine for us, both on the Alpine EZi-DAB-BT and the Pure Highway 600.

From the instructions:
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Using presets
You can store up to 20 of your favourite digital stations in the preset list for easy access.
Assigning memory locations
1. when listening to a digital radio station, press and hold the <3 [Heart] button on the front of the wireless controller. 2.
Turn the Select knob until the preset number where you want to store your favourite station is displayed. 3.
Press and hold the button or press and hold the Select knob to store the current station in that memory location. Previous memory locations can be overwritten in the process. The screen displays "SP GESP." (memory location saved) appears on the screen when the setting has been saved.

Selecting memory locations
Press and hold the <3 [Heart] button. 2.
2. turn the Select knob to scroll through the memory location list and press the Select knob to select one of the preset stations, or press one of the |< or >¦ buttons to move to the previous or next memory location.
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If necessary, update the software (unfortunately, this requires a Windows system, download via https://www.alpine.ch/support...), or also a RESET via the menu or, if necessary, the reset button.