Do not update SudoSu on A 7.1

[dkryder]

it might be because the su binary is in the wrong location i.e. su binary is not in directory that supersu uses there can only be one su on an android install for it to work properly. chainfire, the author of supersu, which is the package we are discussing places the binary in the directory /su/bin . different devs have been putting it in /system/bin. or /system/xbin or /su/bin or /su/xbin. you should locate where the su binary is. if the su binary is in /su/bin then the install is "standard" systemless install. if su is in one of the /system subdirectories the the build has the older system install. you can try to just replace the binary with a newer su binary.