I wondered - is it safe to do this patching?
There is always a minor chance that something goes wrong, but if you make a GDFS backup, then there is no reason to worry.
Will it break any agreements to telephone company or service provider?
Read the contract and you will know for sure. However your service provider will NOT be noticed about unlocking...

Oh yes, Please do something with that rest thing - First time i did that file creation, I was confused ebcause I could find created file in make_rest folder, but it already was in rest folder ... the list is huge. Maybe you could set some kind of attributes to focus to that new rest file? ;)
Can you please explain this in more detail? Thanks.