The 161-in-1 and bootlegs in general aren't guaranteed to work with the converter.
Most of those just barely work, so the slight delay and voltage drop that the converter incurs may prevent them for working.
That's not the case with official releases as they allow more variation on those two factors (delay and voltage).
If a brand new converter doesn't work with original games, I'll exchange it free of charge and will also handle shipping fees.
That actually happened once because of poor solder joints which probably cracked during transport.
Otherwise, I'm legally obliged to accept returns-for-refund for 20 days after purchase (buyer handles shipping fee).