Please note that in your screnshoot the version V20 at the center of top bar don't appear like in our photo. Probably you are using an old and obsolete LUA version. Please download the last V20 version (It is not version 2.0 but the 20th version!).
As is well known, the multiprotocol radio modules of RadioMaster transmitters do not work with the ACCESS protocol but only with the ACCST protocol.
We unfortunately found out only in retrospect a few months ago that FrSky receivers if they have been upgraded with ACCESS firmware with F.Port (and we had upgraded all of them), it is then no longer possible to revert them back to ACCST mode with F.Port by loading the old ACCST Firmware.
The only receiver that we have never upgraded with ACCESS firmware is the X8R because no ACCESS firmware has ever been released for this receiver (but neither has a firmware that works in F.Port mode).
Using our RadioMaster TX16S transmitter with the latest version of EdgeTX 2.8.1 and the X8R receiver connected to a Brain2 control unit in Smart.Port + S.Bus mode, version 20 of our LUA Integration app runs smoothly and without any blockages causing the parameter loading progress bar to freeze on page 6 nor on any other page.
Sorry for the slow reply due to family illness, strange how the previous screenshots don't show v20, just done screenshot and shows v20, I've not done anything with the R-XSR and at moment I back with using the R161, I now thinking of going over to the Frsky rx8r pro with my 470 & 500.
