PinePhone not booting after interrupting update

[PineBetter]

hi there, i bought the phone some days ago , was updating the phone , when a message asking for continuing with the installation [s] r [n] but the keyboard dissapeared and the screen was zoomed. so i wasnt able to continue, then i restart the phone. But now is not booting, only appears the "K" logo moving then stops and appears the mouse. I tried to hold the volume up and power buttons but then again appears the k logo and the mouse again.
If you can help me