Reading ahead is very important before doing the process
Sounds like you have a connection issue, possibly a USB cable that isn't working so great or USB port... Try different cable, ports, etc... Even try using a different computer if available. Try running PDAnet on your computer again and allow it to replace any Samsung drivers it finds.
Unfortunately without a connection between your computer & device you can't flash anything. Everything with the NS4G is done via the bootloader and using fastboot. There is no way of using dropbox, sdcard, etc. to place the custom recovery on the device or even restore back to stock.
Report back with your results, good luck.
Sounds like you have a connection issue, possibly a USB cable that isn't working so great or USB port... Try different cable, ports, etc... Even try using a different computer if available. Try running PDAnet on your computer again and allow it to replace any Samsung drivers it finds.
Unfortunately without a connection between your computer & device you can't flash anything. Everything with the NS4G is done via the bootloader and using fastboot. There is no way of using dropbox, sdcard, etc. to place the custom recovery on the device or even restore back to stock.
Report back with your results, good luck.