No, this device is the other way around; HDMI = input, AV = output (means connect a new console with HDMI to an old TV with AV).

I bought this product to connect my Wii device, I had to return because the output and input of the device was not correct.

No, this adapter works in the wrong direction. To convert the analogue signal of a Wii mini into a digital one, this converter is suitable: Marmitek Connect AH31 (Analogue -> Digital)