Change the rig of the default Roblox Soldiers?

  • What are you attempting to achieve? (Keep it simple and clear)
    Am trying to change the rig of the Roblox Soldiers
  • What is the issue? (Keep it simple and clear - Include screenshots/videos/GIFs if possible)
    As soon as I change the rig (I imported each and everything including the intvalues present in the parts of it) it breaks.
  • What solutions have you tried so far? (Have you searched for solutions through the Roblox Wiki yet?)
    Couldn’t find any useful thing on YT or google. Tried copying the soldier with a new model as the only change but no avail.

All answers appreciated. Thanks!