Upgrade-Problems

Hi cracks,

I have still running m0n0 with 1.32b. But when I try to upgrade the  
firmware, I have downloaded 1.33 generic-pc-image- what is also  
running -
After searching the file and clicking at "upgrade Firmware" there  
suddenly is coming a window from firefox asking me, what to do with  
system_image.php. I can only save this file and nothing else as may be  
"open" but the result ist not successfully...?

Has anybody a hint?

Thanks a lot in advance

Ralf