question about UPDATE

Dec 19, 2011

I have been using MIUI for some time and receiving weekly updates as well.

I am wandering if installing update will put my phone to factory settings or not. I am not looking forward restoring all the programs (and rearranging on desktops) one by one.

Is it like Gingerbread update from Froy which came automatically on my HTC DHD (no settings has been lost)? Or like putting new ROM and reinstalling all over again.

Thanks for your answers.