Hello, I want upgrade new os for my SA4500. The current os 6.3. So I want to upgrade to the lastest version 7.3. Please help me check: I can direct upgrade to the lastest version (from 6.3 --> 7.3) Or i must be upgrade step by step (6.3-->next version-->7.3) Please help me the guide line upgrade. Thank you.very much.
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