Can I upgrade the AEC firmware directly from 188.8.131.52 through 184.108.40.206 to the latest version 220.127.116.11 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 18.104.22.168 firmware.
You would need to upload firmware 22.214.171.124 FIRST and then you can got to 126.96.36.199
The 188.8.131.52 firmware is available on our website with the file name - Software (AEC2.1_FIRMWARE_Upgrade (Archive)). It contains versions 2.1.8-184.108.40.206