2015-04-09, 17:08
(2015-04-09, 16:29)dunghnguyen Wrote: I continue copying your tar file into its update folder (using smartphone to browse the tar file in usb to copy into the update folder) ...this way is correct?
Not sure about the USB part (the Update folder is on your SD card), but there are a number of ways of transferring the tar file to the Pi. As long as you are able to copy the tar file to the Update folder then you've succeeded - reboot to complete the upgrade.
If you're having problems copying the tar file to the Pi, consider installing Leopolds addon and using that method instead.