MDR Proxy Oct 1, 2022 10:31:33 GMT NPAudio and nc8000 like this Quote Select PostDeselect PostLink to PostBack to Top Post by MrWalkman on Oct 1, 2022 10:31:33 GMT Hello,This is a tool which allows us to sidegrade/downgrade the firmware on Sony bluetooth headphones/earbuds.I've made a guide about it here.Feel free to ask questions if there're any!