i just bought a mnbile phone that supported by android ice cream sandwich.. i downloaded firefox from playstore and use it as my browser. however, when i try download pdf file, it couldnt be saved..it said "/mnt/sdcard/download/DfbVfC06.pdf.part could not be saved, because you cannot change the contents of that folder. change the folder properties and try again, or try saving in a different location" what does it mean? how can i download files? because the reason i bought android phone for helping my job easier (checking email) btw, i dont use external sd card. thanks