Sorry, I was going from memory.

You may need to
sudo chmod +x flasher-3.5

and don't forget you can ./flasher-3.5 --help to get a list of possible commands

sudo ./flasher-3.5 -F RX-51_2009SE_1.2009.42-11_PR_COMBINED_MR0_ARM.bin -f

I don't know who told you to use the -RIt flags, R is reboot, I is initialize serial port (you don't have that cable), and t, WTF does that flag do, it isn't documented...