ok so to do want you want you need a file manager app of some kind. i would recommend es file manager. download and open it up. use the app and navigate til you find the media folder/ then audio/ then ringtones. find the ringtone you want to delete and long press until a window pops up then select delete.
i believe your pdf files should be found in the download folder, if they were downloaded.
1.connect your phone to your computer via usb. a window should pop up. select disk drive.
2.a new window will pop up on your computer with the content of your sd card.
3.just copy and paste your cards contents to somewhere you can find it on your computer (maybe on your desktop).
4.drop down your notification bar and then select charge.
5.goto phone settings/sd&phone storage/unmount sd card
6.remove the battery and replace your sd card
7.power on and re-connect the usb cable
8.select disk drive again and copy of your 8g card to the new 16g card.
9.select charge and remove cable.
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