Hi and thanks, rcolistete.

My image file sice is the default for the easydebian uncompressed image: 1,2Gb. The sd card partition format is FAT32.

So, if I have well understood your instructions and the links you have post, I just could:

1º copy/move the image file from sdcard to my PC Debian machine.
2º run the "resize2fs" command for the file on the PC
3º put back the resized file to the sdcard
4º ¿enjoy?

Again, thank you.