GXV 3240 update phone firmware


I am trying to upgrade the firmware on a GXV3240 with an SD card. The phone is currently on firmware:

I format the SD card with NTFS and place the firmware bin file for on the card. The bin file is the only file on the SD Card.

I insert the card into the phone, reboot, and hold the * and 3 key down and the phone goes into update mode and begins the update but eventually fails. I then remove the SD card from the phone and reboot the phone.

I put the SD card back in my computer and it is now unreadable and must be formatted.

I have tried both the latest firmware file for the 3240 and the next sequential firmware version with the same failed result.

If anyone can give me some guidance on what I might be doing incorrectly please let me know.