How to solve a Rubik's cube 4х4 - Step 5
In the beginning of this stage the upper layer should be solved.
In the end of this stage You should have 3 solved upper layers.
Apply the formula of the third step for solution of 3x3 cube. Solve the second layer. Find one of the side pieces and locate it on the down face. Now, depending on how the colors were placed, carry out the procedure shown below.
Repeat the operation with three remained pieces.