I got it working by using 512mb Kingston SD.…And it works correctlly.
Obviouslly, SDHC cards are NOT accepted (see http://en.wikipedia.org/wiki/Secure_Digital , and also references at: https://www.sdcard.org/consumers/compatibility/ (the missing image is available at: https://www.sdcard.org/consumers/sdxc_capabilities/using_sdxc/backwards-compatibility.gif )
In fact, I got a 10 cards pack from a local supplier in Spain ‘cause I was getting sick of the chinesse little verison for this device, and I finally gave up…