I have tested the upgrade on the MT unofficial blog. It is smooth.
Now I recorded the detailed upgrade procedures of David Yin’s Blog.
Backup
1) Login the MovableType system, Backup all blogs of this system, by tab system > tools > backup
2) Use Export feature of the system, by tab system > tools > export
Export every individual blog.
3) SSH to the Dreamhost.
Use tar command to backup all related files.

tar czvf backup.tar.gz ~/yinfor.com/

4) Go to control panel of Dreamhost, Goodies > Manage MySQL > phpMyAdmin
Export the whole database.
Now I have the full backups on different levels. I am safe even the following upgrade fails.
Upgrade
1) SSH to Dreamhost

cd ~/temp/<br />wget http://www.movabletype.com/download/personal/MTP-4.1-en.tar.gz

2) Decompress the package

tar xvzf MTP-4.1-en.tar.gz

3) Copy the decompressed files into the mt cgi folder. I use mtcgi as the system folder.

cd ~/temp/MTP-4.1-en/<br />cp -r -f . ~/yinfor.com/mtcgi/

4) Now launch Firefox.
Enter https://www.yinfor.com/mtcgi/
mt41-upgrade-1

Click “Begin Upgrade” to continue.


5) Then enter the user name and password to sign in.
mt41-upgrade-2

6) After successful sign in, the upgrade starts.
mt41-upgrade-3

The upgrade is finished.
The new look of the backend is shown as below:
mt41-upgrade-4

David Yin

David is a blogger, geek, web developer. Founder of FreeInOutBoard.com. He check David Yin's Blog everyday. If you like his post, you can say thank you here

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