Our customer's SBG 8360 can not upgrade to 10.5.4 then they can not update the pattern.
10.5.4-4 Release Note.
Supported platforms
All supported hardware versions: 8380 purchased after March 2010,
8360 purchased after March 2010, and 8340 purchased after September 2010.
We want to sell a new SMG 8360 for the customer,but we can not find the SMG 8360.
Symantec doesn't provide the SMG 8360 ?