This analysis in Michigan indicates a computer algorithm was likely used to shift 69,000 votes from Trump to Biden in that state. Voting system software has a "weighted race" feature that allows votes to be multiplied or divided by a "weight". This feature is documented to have started in 2002.
Republican precincts and counties are shown to have an implausible linear shift of Republican votes away from Trump and towards Biden. The same linear shift is reproduced in every Republican county with nearly mathematically impossible consistency.