Hi!
I have brought a Marantz RC5000? i don`t know if its a rc5000i or a rc5000? does anybody know how to find out?

Worldwide Marantz RC5000: 1 megabyte of memory. Color is painted gold over white plastic. Base package includes a gold desktop charger plus an appropriate AC/DC converter. Models no longer include the light sensor.

Worldwide Marantz RC5000i: 2 megabytes of memory. Hardware is otherwise identical to the RC5000.

If you hold your finger on the "HOME" icon in the top centre of the display, you will get to the "Settings" page for the Remote. If you scroll thru the pages, you will hit one with the Marantz logo that will tell you free memory. You should be able to judge which model you have by the amount of free memory.

Doesn't the remote have a sticker on the bottom (maybe inside the battery compartment) showing the model number?

I thought this, too. Maybe you have a 5000, and since it does not say 5000i, you were not sure if it would have said the exact model number there. I was looking at a 5000i a few days ago, and it does have an "i" on that label if it is one.