Help Unable to update android os

[SuperTom]

I found out that I can not use the update function on my phone to download software updates for froyo. The update downloads fine, and the installation starts fine. But after the phone restarts it will only process about 20% of the installation, and then start up without finishing the update. I can repeat that cycle for ever, but no update.

Any idea how I can fix this without factory reset?

 

[SUroot]

Are you rooted or not?

 

[SuperTom]

Not rooted no.

Edit: Never mind. It turns out that I had this problem last time I was to update, and found out that I needed more free memory. Appears that I also need more free memory...