Okay, let me say this again.
You
do not have Priiloader- You cannot launch Bootmii, or the homebrew channel, because
you do not have priiloader.
You
do not have Bootmii as boot2- You cannot restore the backup, you cannot launch the homebrew channel.
You cannot use your NAND backup, since you can't get into bootmii.
The only thing you can try is SaveMiiFrii.
Your system is already 4.3- A disc update won't help you.
You literally can only try SaveMiiFrii at this point.
Ah and as Alexander says- if this guide makes sense to you, and you want to spend more $ on a modchip instead of a new Wii, you can do this
http://www.hacksden.com/showthread....-Flashing-Low-Level-Brick-(Full-Brick)-Repair