My sony wireless speakers (2 x srs-x77 and srs-x88) no longer play in time with my 2 airport express units and my Sony MAP-S1. The srs-x77 speakers used to be perfectly synchronised, the srs-x88 has been out of time since I bought it in late 2017 I suspect the August 2017 firmware upgrade is to blame, as it wasn't till I manually upgraded the firmware that the problem started. I have tried several different modems, including using an airport express as the router. It's not an apple issue as the MAP-S1 is still in time with the airports. The firmware page says that's its not possible to roll back the latest firmware. Sony does not appear to be interested in airplay anymore, unfortunately my 3 units are basically bricked for the purpose that I bought them. Has anyone else experienced this? Does anyone know of a way to reinstall old firmware? Thanks.
