Originally Posted by tallman43
Sorry litttle confused by your post
First thing first you do not need to root your phone to install a custom rom they come already rooted...Second thing you do not install custom roms in download mode you flash them via a custom recovery such as PhilZ recovery,Twrp or Cwm recovery.
Are you saying you are stuck in download mode? If so did you pull the battery?
Thank you for such a prompt replay. Sorry for the double posting. You probably already guessed that I am a little confused, too.
Well, my chain of thoughts was that since I didn't have a custom recovery installed, I had to boot in download mode to install it with Odin. Then I planned to boot to recovery to flash the SlimKat ROM.
I am now embarrassed to realize that when I arrived at the "Downloading... Don't switch off your Phone" screen, and didn't know how to proceed, the phone was, in fact, in download mode. I didn't notice the very small, red letters in the upper left corner saying "Odin mode". Things are a lot clearer to me now, and I have successfully flashed the ROM. I hope you are a little bit less confused, too.
Could I spend just a little more of your time? The reason for using the SlimKat ROM was to speed up the rather laggy Galaxy i9300. Do you have an idea which ROM would serve that purpose best?