Jim Kirk
Occasional Visitor
My mesh setup is shown in the signature. Upgraded today, 7/11/2018.
Used the Web GUI to update the mesh (parent and two nodes) from 21045. Single click did all 3 routers.
No reboot needed. Took about 5 minutes from clicking Administration>check update>then click on update.
When parent finished the update it came back to the web interface (signed in again) and both nodes were showing with clients attached.
No issues at all so go-for-it with some confidence the update works.
Maybe next update I'll try from the Router IOS app but for the last two updates, 21045 and now 21140, I used the web interface and had no problems.
If someone updates via the IOS app (and they have an RT-AC5300 parent and an RT-AC5300 node) please post how it went.
Jim Kirk
Used the Web GUI to update the mesh (parent and two nodes) from 21045. Single click did all 3 routers.
No reboot needed. Took about 5 minutes from clicking Administration>check update>then click on update.
When parent finished the update it came back to the web interface (signed in again) and both nodes were showing with clients attached.
No issues at all so go-for-it with some confidence the update works.

Maybe next update I'll try from the Router IOS app but for the last two updates, 21045 and now 21140, I used the web interface and had no problems.
If someone updates via the IOS app (and they have an RT-AC5300 parent and an RT-AC5300 node) please post how it went.
Jim Kirk