hello guys im new here!
and my questio is...
i have t650 cid52
so i read some theards and i saw that i can flash to anything i want???
like flashing that t650 to k810i?or others anything i want?
if yes plz tell me a good one to change to
if i cant do that just tell me to what i can and what the best of the ones i can
thnx!

First, welcome to se-nse.

Secondly, where did you read that you can flash it to anything?

You can't and I repeat, can not flash your T650 to anything other than T650i firmware.

so tell me two things plz!
whats that the t658 its like k800to k810 its possible?
and why i saw someone with k810 firmware and w880 acustic whats that mean?

Well you have to see if it is similar.

That just means that someone modded the acoustics, so easy to replace the original ones.

U can flash T650 to K770 if u want !

yeah, only if the two handsets hardware is really similar you can flash it, the k800->k810i one, both have REALLy similar hardware, (maybe even the same, not sure) and thus you can "upgrade" it with no problem. you should do a search on what you can convert you t650 to.

and yeah acoutics , that just means , ah, its like a sound driver, makes your speakers louder or better or something

im not completely sure because im quite new too, but i hope my noob language helps you to understand a bit.

You can flash to anything you want, just know that it will NOT work.
Except for those already tested, like as Bip said, T650i -> K770i should be possible.
Note that they have to have really similar hardware to do so.

Acoustics drivers change the way your phone produces sound. It can adjust the Bass, Treble, Loudness, Reverb, etc. These acoustics drivers can be based on any phone.