I bought 2 DNS320L 3 months ago and they were in A3 spec. I went to 1.07 and everything was ok.
I received yesterday another unit. This one is a A4 version, in 1.06 firmware. I tried the 1.08 firmware on it but unable to get SSH access (what is the password ?).
So i am going to install 1.07 wich allowed me to gain SSH access with the previous units.