If you have bootmii installed as boot2 then you should be able to recover this. Do you recall installing it as boot2 or as IOS? If it'd newly bought then it's unlikely to be boot2, then you never know.
I'm unfamiliar with the tutorial you have linked to but do wonder why you haven't asked at that place as they will be familiar with their tutorial more than we are.
I can't work out why you'd need to update to 4.0 and then to 4.1, it would have been more prudent to go straight to 4.1. Oh well.
Updating to 4.1 would have rendered preloader uninstalled, it's funny that way.
Savemiifrii = savemii. If one doesn't work then the other won't either. Worth a try.