The Pilgrims defeated Hereford FC 3-2 at The Jakemans Stadium despite Rory Huntbach and Greg Preece firing the Bulls into a 2-0 lead. Preece was also denied from the penalty spot by Harry Payne.
Bailey Forth cut the deficit for United, Jordan Tate equalised five minutes later and Brown capped a glorious comeback in the unbelievable fashion.
Boston (4-3-3): Harry Payne; James Gordon (Brian Tumfour 90), Jack Withers, Bailey Forth, Callum Rodger; Jordan Tate, Harry Vince, Peter Evison; Ben Lawrence, George Smith (George Hobbins 49), Jack Brown. Subs (not used): Jenson Ball, Oli Drummond, Connor Stocks.
Referee: Rob Evans.
Attendance: 175.