Can you change your Hwid permanently?

Are you talking about hardware ID? If yes, the only way is to change or upgrade hardware. Hardware ID is calculated from devices’ IDs and user has no influence to this process unfortunately.

How do I get around a Hwid ban?

How to keep playing HWID even after you’ve been banned
  1. File a Complaint on an Official Support Page.
  2. Use a Hardware ID Spoofer.
  3. How to Play Multiplayer Games Even After Getting HWID Banned.
  4. The Best HWID Spoofer by Battlelog. co.