Hello people

I just bought Kobo Aura H2O2 and it looks amazing. The thing is that i would like to have greek keyboard for taking notes. Searching for solutions, i discovered the firmware and patching stuff.
My current software version is 4.9.11311.
I am newbie to whole firmware,patch,OS etc thing so if you have any tutorial i would be thankful if you could share it!
Regarding my problem should i down grade an try to apply the patch and implement greek keyboard or wait for 4.9 ver patch?
Thank you in advance!