the latest FW versions are
RTU: 8134CAA_PRG_2001_V02.00.02
APP: 8123AAB_PRG_2001_V02.00.00
The FW upgrade of an FTD to these FW versions will only be possible from the following versions
RTU_V01.03.00
APP_V01.00.07
Contact Support before attempting any FW upgrade on your FTD