Originally Posted by Rabid1
Get a Sd tool like Sdformatter or Easeus. Remove the internal SD and try to repartion and format it. If neither app gives you errors you can reuse it or take the opportunity to put a larger sd in the device.
When you have two good sd, place one back in the FT3 and reassemble. The place the firmware files on the other card, insert it in the FT3 and flash as normal. The firmware will rebuild the internal SD card.
So you mean to say just format the new sdcard with sd formatter and insert in the internal card slot. And the installation process is the usual one ie copy installation files on another sd card and insert it on the external Sd card slot and start the device. right