Well i performed the LLF but in vain. It didn't help. Still the samen problem. What i cannot understand is when i delete a file as for example the gmapprom.img and i explore the tree before disconnecting the device, the file is not there anymore. When then i disconnect the device and connect it back to the computer tahn again i see the gmapprom.img on the device. If i add a random file or map on the device, i see it in the tree. When i disconnect the device and connect it back, the last added random files or map dissapeared. It looks like the device is protected agains deleting or adding files or folders. Very strange isn't it. What more can i do?