Modo had the chance to decide the series at home in the last match - instead, Bik won and secured a seventh and decisive match.
Modo took the lead through Elton Hermansson, but Bik Karlskoga turned both the game and the series around.
Simen Andre Edvardsen equalized on the power play, and Oliver Eklind scored 2–1 early in the second period.
Modo pulled their goalkeeper at the end, and Karlskoga then scored two more goals - Hampus Plato and Oliver Eklind, who scored twice.
The final series, a best-of-seven, starts on Wednesday in Umeå.
