It’s v6 of this classic, and it does not require any case modifications and takes minutes to install. If you have a Nintendo Famicom and are struggling to get it working on a modern TV, then this composite and PSU upgrade board may be the solution you are looking for!
In the video I dig out the original prototype, which was all a little bit jank, then walk through fitting the new board, including keeping your solder sucker clean. As ever, I make these right here in the UK on my bench.