I had read some discussion about this particular seller in Neo-Geo forum between a couple of members and it was good things. That's why I bought from him in the first place. In this forum I asked info about duijidance guy and people weren't happy when they heard his name. Then I saw this video and I was terrorised for what shitty modded console I might have bought a week ago.
I spoke with Keith Courage he gave me some advice about DUO R models in general and where I need to be cautious. I then bought a T10 screw driver and opened the console to see the guts
It was advertised as RGB modded, region free, jailbar free. It was also advertised to have a brand new CD lense and to be fully recapped.
Yesterday I received my first HuCard and I am happy with RGB quality. No jailbars to distract any attention. I have an issue while playback audio CD and I have told to adjust the V102 potentiometer and if nothing happens, then move on to the V101 potentiometer. Tonight I will try to fix it.
That region mod would still require a voltage fix for everdrive function though
Many thanks to Keith Courage for helping me out. He is really a great guy and he loves PC Engine. He has a lot of knowledge in modding the machine.