Release date UBports PostmarketOS PostmarketOSwrite to ext. SD PostmarketOScalls 1 Android phones 2008 not possible with current Android versions 2 PinePhone 2020 yes,possible to write to ext. SD yes yes work 3 Xiaomi Redmi 9 2020 Recommended for advanced users,not possible to write to ext. SD yes no no 4 Fairphone 2 2015 yes, but …