I updated an AP510-i to version 7.9.5.1 using the AP5xx-7.9.5.1-036R.img file, and after that, I can no longer access the management interface via the web. I was using it in standalone mode and do not have a physical WING controller. Was standalone web support removed?
Correct, GUI was removed for said AP in this version of code. You can configure everything via CLI. If you need GUI access you will have to stay on 7.7.1.11 code.
