At the time when I sold the 202te, the version of ADM was pretty unstable/buggy. I had suffered from intermittent network disconnect for months and the problem cannot be resolved by Asustor TW support (with more than 10 emails). It seems the root cause of the problem was a buggy CIFS/SAMBA service. I just don't want to waste any more time helping to debug the firmware!
Swap out 202te -> swap-in 251C -> problem solved! The QNAP QTS is very stable.
The stability/matureness of firmware!