May say only what this ftp was not supported for actual moment!
2x5 is more newer device than 2xx and have absolutely different software. Occur in nature hybrid 2xx and 2x5 what have a name 2xx but it use software from 2x5 with his functional with some exception. This hybrid have ID for 2x5 series. But no 2x5 device with software for 2xx! Old king died - long lucky life for new king hence