changing settings on Aeon multi sensor

I have managed to get my Aeon into UI5, recognised as 4 devices, so far so good. (after installing new aeon firmware and running the newest beta UI5) i am trying to change some settings, like motion timeout or polling frequency. When i change anything in device options, it seems to try to send it to the sensor, on the device i get waiting for device to wake up. When i manually wake it to speed up the process, i get failed at setting user configuration. I have left device options - data size at 1 byte dec (that seems to be default) and just added a number in desired value, closed with x and the saved. After that i get the failed message

3-Motion timeout data size must be at 2 byte dec.