Initially:
I was so exited about AmaxInno Freestyle 7" v2 that I bought one more and used some 4in1 and Revolt I found in my spare box. Unfortunatelly I had to take the Emax LS2207 1900kv from other quad which is now grounded.

On 23.11.2018
I like testing so I switched the RevoltV2 with Helio Spring. Setting up a Helio was bit of a pain because if you have RX powered via USB it is messing up with "bl" command and I had to manually bridge the boot pads to get into DFU. Also flashing IMU-F did not work well for me the first time. But I guess it was due some error in BuF code that was not flashe properlly. I managed to make it work after using PegasusUI and manually bridging boot pads. Now I am on latest fw version of BuF and IMU-F.
Quad flies pretty well I just need more time to test it and tune it which is bitt difficult in winter due to short daytime.