It is still possible to reconnect the original Aria scales, but it's getting to be very complicated process. Fitbit still have the start page.
https://www.fitbit.com/scale/setup/start
Remove battery for 10 seconds, then tap to set into Setup Mode
However. You need to connect to an older WiFi protocol, which means 2.4GHz . If you router supports it, create a guest network just for the scales, still with a password.
The next step is complicated. Fitbit have removed the DNS settings for your PC to connect to the scales over the scales network when you connect to it. If you know how, add
192.168.240.1 1.scale.www.fitbit.com
into /etc/hosts file. The start page at Fitbit will then go to the scale's network page. You will need to use Chrome or Firefox, with Advanced to ignore the unsecure HTTP connection. The scales network page should then show your Guest network (or existing 2.4GHz network) SSID. click, enter password, it will then connect and work.
You do get the feeling Fitbit don't want people using the original Aria scales anymore ....
