Im using desktop computer with wireless connectivity unfortunately
But im connected to the dumb ap, so the connectivity is not gone
It may drop out as a function of the other side of the connection not being tagged yet (main router). If your device is actually connected to the main routers radio (and not the dumb ap) the device would no longer be able to communicate with your computer until it reverts back.
And if I will force save changes, it will help?
Yes, it will prevent the rollback. But you will likely lose access until the other end of the link is configured for the tagged network. It's a bit of a chicken or egg situation.
You may need to setup another network to manage this specific problem...
You can add one that uses an unique subnet relative to your current networks, then add it to the lan firewall zone and finally link it with a wifi SSID (don't worry about making a bridge -- put it on one radio, that's all you need). This will be a temporary network that can be deleted later, if you want. From here, you can connect to this new temp management network and run the configurations... unless something goes horribly wrong, you'll have access even if the ethernet ports get locked out.
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Thank you for all your help 
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