A2049 is the US version, A2155 the EU version. The discussion I read here is about both.
I cannot imagine the difference between the two to be that big unless they use an entirely different DAC in EU.
I received the A2155. I use stock Android 10 and UAPP.
First impression: That sound... it is just awful !
It sounds worse then my onboard Qualcomm (ZTE Axon 10 Pro), worse than Tempotec HD (non Pro), worse then CharmTek T22 or eSynic DAC...