It is necessary to return it. 2.0 and 3.0 bug are recommended. MEUI9. 1 or 9.0 10 is not bad. Mine is HarmonyOS system 2.0, which is quite good, except for the fever when charging, the rest is not bad! According to my own experience, you can't save electricity at 9, 10, 1 1 2.0 at the same time. See what you pay more attention to.