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We have a TL-ER5120 v2 with firmware 1.0.8 Build 20140212 Rel.36037

I am setting up the monitoring of our devices and I wanted to include the TL-ER5120 in that monitoring.

In the doc, it states how to do activate SNMP (section 3.6.3 SNMP of the user guide v2.1.0).
When I go in the device interface (logged as admin), I can't find the Maintenance/SNMP entry:

Name:  ER5120Maintenance.jpg
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Could someone tell me what I am doing wrong?

Thanks in advance,