Yeah by flashing the NAND with a working backup or flashing boot2 Bootmii if capable.
Here's your problem:
- You don't have boot2 Bootmii or Priiloader installed.
- You have system menu 4.3 (only game exploits work)
- You can't run any game exploits because you can't run games
If you had Priiloader, boot2 Bootmii, or even a different system menu it would be easily repairable.