There is my problem, i need update my maps in my TT ONE XL, bud internal memory has only 960 mb (free about: 920 mb), can any one tell me wich maps I could use? I want to upload Central Europe 975.7748 but I don´t have enough space in intrnal memory... What should I do?
There is my ttgo.big file:

[TomTomGo]
DeviceName=TomTom XL
DeviceVersionHW=ONE XL (v9)
DeviceSerialNumber=RBxxxxxxx
DeviceUniqueID=AKxxxxxxx

Before we can help we need to know what version of navcore you've got installed on your device & if it's got an SD card slot or not?

Have another look at your ttgo.bif file and find the following and report back and we can go from there:

ApplicationVersionVersionNumber=????

RB is a XL 30 series, so no SD-card slot.
You'll have to manage with the remaining 1GB storage.
Could you clearly indicate which coverage you want/need?

Here are the remaining lines from ttgo.big:

ApplicationVersionVersionNumber=8012
ApplicationVersion=9370

And as Razorblatte said this version of TT has not any sd card slot. It has only 1Gb internal memory.

I would like the map of Central Europe, namely the Czech Republic and surroundings states.
But the problem is the size of the memory.

Can you use Eastern-Europe? Do you need Germany?
Tip: Eastern_Europe is not the same as Europe_East.

Check for coverage here

Germany would fit me too, but at worst I can use Eastern Europe to. Thanks

It still is not clear to me what coverage you want. Be sure to check which map is supported by your current navcore software.