Enter ##3282# and enable DM....you are using Box so
no need "CMDA Workshop"...but for more undestand what's MSL Code in SPRINT HTC get one eye here:
Easy way to get MSL without calling Sprint, using CMDA Workshop, OR ROOT!!
You Not need any Free program Not for all SPRINT just use Microbox and make sure set phone as First step above and how SW prompt.
BR
allumts