@Exerqtor I bought the clone paneldue in 2019. Never got it working then, but had not tried that hard either. I did flash the v3 7in firmware this morning by mistake and the colors were all messed up on the display.
@jonasbaleine the original part number is probably HB950-9.50-4P but there are likely to be alternatives. Search for "9.5mm pitch 4 way barrier terminal block". For example, YK4410403000G looks suitable.