iPhone OS upgrade to 3.1

Since I have my (3GS) 3.0 ECID SHSH on file with Cydia, I decided a while ago to update to 3.1. So I Pwnagetool-ed a ipfw and installed. Now, I wanted to try out the new modem firmware too and updated to official 3.1 firmware, only to come to conclusion it makes things more difficult and fixes nothing. Anyways, I went back to 3.0 and had to redsn0w it because it doesn't work with the new modem firmware. Then I installed the pwned 3.1 again and it works again.
Again, AptBackup gave an error but was easily fixed by duping the list files, press backup, restore list files, restore.

Security tips:
vim /Library/LaunchDaemons/com.openssh.sshd.plist
Remove <key>Bonjour</key><array>...</array> to hide from bonjour (local net).
If you want to change the portnumber from 22 to 443 or so, you can change SockServiceName from ssh to https or perhaps some number.
Connect with -p option: ssh root@your-iPhone.local -p 443
After changing, toggle SSH off and on and then connect with a 2nd terminal to try it out before closing the 1st.
And as always, don't forget to change password for mobile and root.