orbi 770 connections issues + a strange ssid

thank you very much for your answer, those model were released in 2020 is there is a chance they are still updated ? because they are expensive too... and i don't want something that wont be updated 😕 or maybe it's not the same thing like phone when you need the last update and it can be "bad" if you have an old model that doesnt have support anymore. (very sorry for my english aha).

what do you suggest me to do im very lost...  there is a lot of different model like the 860 why it was realsed in 2023 ? its like the same that 850 ? my parents have the 750 never had issues but it was out in 2020 so 4 year...

thank you