Let’s make pairs to see what we are working with

cb ae a5 a8 cd af b7 b0 ab b6 b1 ab b1 cc a8 c9 a7

Look at where numbers should be in the passcode format, they all start with c. Use Hex Atbash using this index

0123456789abcdef
fedcba9876543210

34 51 5a 57 32 50 48 4f 54 49 4e 54 4e 33 57 36 58

Convert hex to Ascii

4QZW2PHOTINTN3W6X

Alternate between Rot +1 and -1

4bhk2bletchleyz9q3t

Make a 3×5 grid

Reverse rows 1, 3 & 5

Read going down from the upper left 5

5gwd4hozhos9e4u