Mate, if you're trying to move your Fonts and/or Applications out of the root directory to free up some space, I'd like to suggest the method I've been using since day 1, which is pretty much the raw command line method BossTool was built on. Assuming you're on Windows, get the app PuTTY HERE. With your iPhone hooked onto your WiFi at this stage, run PuTTY and input your iPhone's IP address and click on 'Open'. Type in your iPhone's username 'root' & password 'alpine' when prompted. After you're successfully logged in, run the following commands. Press "Enter" after every line

FOR APPLICATIONS :

# mkdir /private/var/Applications
# cp -Rp /Applications/* /private/var/Applications
# mv /Applications /Applications.backup
# ln -s /private/var/Applications/ /Applications
# rm -rf /Applications.backup

FOR FONTS :

# mkdir /private/var/Fonts
# cp -Rp /System/Library/Fonts/* /private/var/Fonts
# mv /System/Library/Fonts /System/Library/Fonts.backup
# ln -s /private/var/Fonts/ /System/Library/Fonts
# rm -rf /System/Library/Fonts.backup


Be sure to copy everything EXACTLY as above, down to the cases and spacings. After done, reboot. BossTool should now show the rightfully reduced root partition size as intended in the first place Good luck, mate!

OUCH In that case, I assume you downloaded BossTool while you were somewhere else? It is seriously very difficult to do things which involve accessing the iPhone's filesystem without a wireless connection. If BossTool is your only option, then I would suggest an Uninstall, Reboot, then Reinstall. That's the only short-term solution I can think of right now if you're limited to BossTool.

Not very possible nor practical on the phone alone, unfortunately mate Perhaps you could visit a friend and borrow his/her PC + wireless?