The new slave firmware also supports the PWM option on fan channel #4 now.
IMPORTANT: install the display back on it and reset it [four jumpers on temp input 5-8] before you run the downloader. The downloader will already check all connected devices and registers them on the licensing server. If you connect the device while it is a LT version it will be also registered as LT and will likely not be entitled to get a aquasuite 2017 license while a XT variant will get it for sure. Same thing if you already have a running aquasuite 2016-5 or 2017-1 installation.
If you also own another aquaero XT or any other device that currently receives or already got a 2017 license this step is not mandatory but still recommend.
Thanks. The question now is, how do I flash it?