Can I upgrade the AEC firmware directly from 18.104.22.168 through 22.214.171.124 to the latest version 126.96.36.199 v1?
Unfortunately you can't do a direct upgrade to the latest version as there is a security vulnerability patch that isn't in the 188.8.131.52 firmware.
You would need to upload firmware 184.108.40.206 FIRST and then you can got to 220.127.116.11
The 18.104.22.168 firmware is available on our website with the file name - Software (AEC2.1_FIRMWARE_Upgrade (Archive)). It contains versions 2.1.8-22.214.171.124