What is the Ril?? and what does it do? Can someone explain and let me know how to install it?
read
this for info on ril.
basically, it's a layer between your phone and radio. you want your ril to match your radio for optimal performance, but your phone will still work even if they don't match (at least, from what i've read).
installing ril is simple, you just replace all the corresponding files in /system/lib folder. you can backup the files if you ever want to switch back or you can just install the rom again.
again, the ril provided with the latest radio is the same one that comes shipped with most of the roms in the forum, so most likely you won't have to worry about it.
if you want to check your current ril version, go to terminal emulator and type:
su
getprop gsm.version.ril-impl
cheers