You can downgrade VIA E3 FLASHER your second PS3 to a CFW and use FTP server.
OR
You can downgrade VIA progSKEET your second PS3 to a CFW and use FTP server.
OR
You DON'T have to downgrade with progSKEET because once you get it set up, you can add/remove files off your PS3 on the latest firmware.
ProgSkeet wins