There is so much you can do
You can upgrade or downgrade also you can delete the language or just not use it
So you can upgrade that is supported by your berry
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I say keep the .110 and wait till another os upgrade comes out wit multi-lang.
There might be a way you can keep the greek on ya berry by selecting the language on ya dm when you add or remove what you would like to install
Posted from my CrackBerry at wapforums.crackberry.com