They tried to introduce a "feature" in 3.17.x that was trouble and had to drop it in 3.18, I would avoid 3.17 anyway. The advboot download at the link I posted should work with your device on 3.7.0. (I don't use Nickel for reading so I haven't "updated" the Kobo firmware past 3.5.0.)
Luck;
Ken
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