You can try this thread for Bootloader.
As far as your question, Id love to help but I think Ill wait for someone else to chime in. I dont like to give and answer about bootloader...
OK. Figured it out. Download the apk from this link. Its an old very of vvm
Turn off WiFi and set up vvm with this app. It will set up OK, but on second launch I was getting FC. No worries...
I am really excited to see another dev (even if you are a n00b) building cm13 for the s3. Thanks a bunch. I can't wait to try it ... Probably will flash tonight waiting for the ball to drop. Do you see flaky cellular data in your builds?
-Synced to Sept.4/15
-Many stock kernel commits
-SlimPie is back
Commits can be seen here: http://review.pac-rom.com/#/q/status:merged