Easiest way to reset ps5 controller?

If it still won't pair after the reset, swap the cable. A lot of the ones lying around are charge-only, and the console never sees the controller through them. The one that came in the box always works.

Turn the PS5 off first. On the back of the controller there's a tiny hole next to the Sony logo, push a pin or paperclip in and hold about 5 seconds. Then plug it in with a USB cable and press the PS button to pair it again. if you skip the cable step it just sits there blinking and looks dead.