I decided to post this when people were sayin Norton Antivirus was picking up overflow.tif as a virus. SOme of you may remember a post on this forum coming from 'pspteam' claiming that they had a created 'patch' that would edit v2.0 so you can run Homebrew. Well this actually deleted important files and bricks your PSP. It is this patch that is the Virus. Overflow.tiff is included in the file so Norton think's its a virus.
The downgrader is 100% safe!