NES Mini Classic - Sound bug at boot

[Deenosaurus]

Hey there,

I just flashed a snes - which worked like a charm - and now a nes. At factory settings the console boots up and the menu music starts playing, after flashing with hakchi2ce I get weird noises before the menu music starts playing.

I've already went back to factory settings and flashed again, still there.

Any solution to this?

Thanks!