Issue connecting Polar Vantage V

[flblanc]

Dear @rsc-dev,
I get the following error message when I try to connect loophole to my Polar Vantage V:

.../__init__.py", line 502, in open
assert self.ep_out_0 is not None

I realize the Vantage series was not out when you wrote the code, but would you be so kind as to look into this matter, or perhaps give me some pointers so that I can try myself?

Many thanks in advance.