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Unfortunately the market is quite not clear about this situation thanks to an intemediate verson of the Helio 2x SoC family.
The Helio P20 (MT6757 at 2.3GHz) was the first one and that SoC is used in UMi Plus E and in UMIDIGI S2. It's used in some other models as well but with LPDDR3 RAM chip.
The Helio P25 (2.6GHz but the case label is not yet known) will be used in UMIDIGI S2 Pro and I don't know any other smartphones already available with that SoC.
However, there's an intermediate SoC version between above the two units above labeled MT6757V and clocked at 2.4GHz. In UMIDIGI's portfolio the Z1, Z1 Pro and S are based on that processor and there are a lot of other brands and models (Doogee Mix, Maze Alpha, Bluboo S1, Samsug Galaxy J7+ etc.) using that processor. Some brands call it Helio P20 (UMIDIGI for example) but most of them advertise it as Helio P25. Samsung has applied the best naming by calling it Helio P25 Lite. Yes, the MT6757V processor is identical to the full power Helio P25 but with a lower clock speed, so it's a light version of the Helio P25 SoC.
Conclusion: Not intentionally but UMIDIGI was misleading when it advertised the Z1, Z1 Pro and S models with Helio P20 since in reality they are based on an underclocked version of the Helio P25. Knowing the information above, you can guess why the Z1, Z1 Pro and S could be released with Android Nougat out of the box but not the S2.
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Post time 2017-11-13 18:13:10
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Post time 2017-11-15 14:52:50