First question, can you tell me, what cable are you using with M0? On previous models, we had some people using random cheap cables from Ebay, which resulted in less than ideal sound. I remember one case, where such cable made Mojo into super bass heavy device. Changing to Shanling L2 cable fixed it. Secondly, M0 is not running Android, so there are no errors of system that UAPP is trying to fix. Thirdly, EQ setting is not "still active", it only activates when you enable EQ. Also, now going more into audiophile side of thing, different transports can sound differently. But on that note, I don't think we were getting any reports of M0 sounding subpar and we have a lot of people using it with different DACs. So earpods works fine and just your SOny speaker is misbehaving? Can you tell us, which speakers exactly are you using? There are other users with M0 and Sony speakers and seems to be doing just fine. When using M0 as Bluetooth receiver, of course you can charge it with standard USB charger.