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I am having the same issue as many many others posted elsewhere (Amazon and co). This is the only thing why this switch is "not good and not acceptable" for me.
TP-Link disabled completely modifications for VLAN 1 even in Web interface as in the mgmt software.
My issue is, that our company's network topology even uses tagged VLAN 1 packets in the "Switch Inter-connections", untagged packes are only allowed on the client side ports. To get the TL-SG-108E switches part of the network (we already ordered 10 pcs of them) they must accept and repeat VLAN 1 tagged packets but all the options to modify that are greyed out. In this case I need to set some ports VLAN 1 to be tagged (for the way to another switch) some to be forbid (when they should NOT be part of VLAN 1) and some to be untagged (for client connections).
I know, that you can not compare a HP enterprise switch with this "cheap crap" but the "cheap crap" may be also very good and usable with only unlocking this feature.
For 99% I think that it is only a software limitation, so with a modification in firmware this problem should be completely solved.
Even the setting of the mgmt vlan should be possible!!!
Please, please, please, if possible dear TP-Link team, please implement a fully working VLAN configuration into that brand of switches.
I or we know, that it is possible to close out ourself of the web interface but therefore we have a good working reset button