android root permission.

I’m trying to install a finance-related app on the kiosk, but I can’t use it due to root privileges.
First, through ES File Explorer at the kiosk

  1. system/bin/su
  2. system/xbin/su
  3. system/app/SuperUser.apk
    I deleted the file myself, but it is not deleted.
    The second attempt to release root privileges through supersu.apk or kingroot.apk file, but the bin update does not work, or complete root privilege release is attempted but does not work.
    Kiosk Android version is 7.1.1 version and firmware version is V1.0.
    Please tell me how to release root privileges through adb or a specific program method to release root privileges.