They would both have to win out (Colorado could for sure, but TT has Iowa State and Colorado)

Then they would need Iowa State to lose multiple games, Texas Tech would need to beat them, and have them lose, Colorado needs them to lose 2 times

They would also need Kansas State to lose, Texas Tech would need them to lose to ISU, Colorado would need them to lose a game, but they are the best bet at giving Iowa State one of those 2 losses that they would need, so they would have to beat ISU but lose one of their other games

And even despite all that BYU would very likely still be in at 12-1 over any 2 loss team