Fakebold not working on mathbb fonts

Question

documentclass[a4paper, 12pt]{article}

usepackage{amsmath, amsthm, amssymb, amsfonts}
usepackage{fontspec}
setmainfont{latinmodern-math.otf}[FakeBold=4]

letmathbbaltmathbb
usepackage{unicode-math}
setmathfont{latinmodern-math.otf}[FakeBold=4]
letmathbbmathbbalt

begin{document}

begin{align*}
        v & inmathbb{V}
        f & inmathbb{F}
    end{align*}

end{document}

This is the output.

documentclass[a4paper, 12pt]{article}

usepackage{amsmath, amsthm, amssymb, amsfonts}
usepackage{fontspec}
setmainfont{latinmodern-math.otf}[FakeBold=4]

%letmathbbaltmathbb
usepackage{unicode-math}
setmathfont{latinmodern-math.otf}[FakeBold=4]
%letmathbbmathbbalt

begin{document}

begin{align*}
        v & inmathbb{V}
        f & inmathbb{F}
    end{align*}

end{document}

Here is the output without the let command. It is bolded but the font is not computer modern mathbb. I would like the computer modern mathbb font fakebolded

egreg · Accepted Answer

The problem is that you're loading amsfonts and amssymb.
With your let commands you're reverting to the blackboard bold letters from amsfonts that obviously don't respect the FakeBold=2 option.
documentclass[a4paper, 12pt]{article}

usepackage{amsmath, amsthm}
usepackage{fontspec}

usepackage{unicode-math}
setmathfont{NewCMMath-Regular.otf}[FakeBold=10]

begin{document}

begin{align*}
vinmathbb{V}
finmathbb{F}
end{align*}

end{document}

I used 10 in order to make the bolding more evident.

Here's the output with FakeBold=2:

In order to limit the bleeding from my eyes, here's the output without FakeBold:

Fakebold not working on mathbb fonts

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