Finding "official" builds is difficult due to the MediaTek chipset's limited source code availability, but unofficial community builds exist on the XDA Developers Xperia XA1 Forum e/OS community
The XA1’s 2300mAh battery (or 3430mAh on the Plus) was mediocre in 2017. In 2025, with stock software, background Google Play Services and Sony diagnostics wreck the battery. sony xperia xa1 custom rom better