Hacking Graohical issue after HWFLY install on switch lite

[jakebox]

Hey guys,
Sorry if this has been asked before I've tried searching but didn't have any luck.

It's my first time modding a switch, I bought a spare one just to learn on. But I think I've broken it. It glitches and boots fine but the screen is glitching out.
Any idea what I may have done or if it can be fixed?

Thanks for any help!