I just bought a second SB3000TL-21, it also had the same issue with the lock showing on Sunny Explorer and no data available, but it came with a PUK code which I used to successfully unlock and I was then able to set new User and Installer passwords and full access was obtained.
I just bought a second SB3000TL-21, it also had the same issue with the lock showing on Sunny Explorer and no data available, but it came with a PUK code which I used to successfully unlock and I was then able to set new User and Installer passwords and full access was obtained.
When you get the puk it only works against either user or installer, SMA should tell you which it will work with but I only had the code so had to try it against both.