Mine came with steel strings that I was told were Cavaquinho strings though it always seemed odd as they all appeared to be pretty much the same gauge? I tried tuning it to DGBE and it made a very interesting sound but I always had trouble tuning it as the D sting did not stay in tune as you progressed down the neck. As I suspected the strings I got a new set of D'Addario Cavaquinho strings and found these strings were noticeably different in gauge size. In trying to restring the Cavaquinho however I found two issues. Firstly, it is definitely hand made but on close inspection not particularly well and second it is tricky to string a Cavaquinho and I broke one of the new strings! The not well made was by far the biggest issue though, and this is exacerbated by the softwood Pine soundboard used on Cavaquinho's (that is why they have Golpeadors, though mine is fake and just wood stain. The bridge was not very well set up and it was very difficult to string at all - at one stage I thought I wasn't going to manage it but in the end I have managed to get a set of black Picanto nylon stings on. I don't think I will try and change them now and it tunes up fine as a Soprano with a gCEA tuning. Even though it no longer has steel strings on it still has quite a distinctive tone and a lovely pine smell.
Now I have other Cavaquinhos with the steel strings on so I can set them for D~G~B~E and for D~G~B~D - and I could always get another Minho Cavaquinho especially if I went to Portugal and saw a nice local one.