If you still have this issue, press and hold both the on/off button and volume+ button and keep pressed until the device restarts. It should then show you a recovery screen. Choose the wipe/boot option and restart. Make sure you eject the MicroSD card before you do or risk formatting it as well. You may need to re-copy the FW image file again. But don't be surprised if the new FW is installed and it just needed the reset.
The wipe date/factory reset only clear the internal storage, and firmware is not removed but simply reset/initialized.