K610i customization?

I'm new to SE modding and I'm interested what can be customized on k610i with cid51?

compy6014 Only by Wotan,Davicnhi,Kulakendi or TMS. There is no free solution.

and the firmware is free?

Firmware you can download by Download section of these on-line clients

Now you can use free tool like far manager or xs ++

and maybe setool lite

You can take advantage of the Cruiser serverclient which offers Free flashing and customizing of all db2010 and db2020 all CIDs...