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Based on the official response from Umi Digi Facebook's Official Page (https://www.facebook.com/umicommunity/) made on January 13th, 2018 they said:
"Until now we released Android version upgrades for each flagship model, that had been still in production if the upgrade was technically possible. As manufacturer of the processors, MediaTek provides not only the hardware, but also the Android software development kits (SDK), which are must-have tools for building smartphone ROMs.
What they've provided until now (chip - UMIDIGI model - Android version):
MT6737T (C Note): 6.0 and 7.0
MT6750T (C Note 2, C2, Crystal 4/64GB, S2 Lite): 7.0 and 8.1 coming
MT6755 (Super, MAX, Plus): 6.0 and 7.0
MT6757 (Plus E, S2): 6.0.1 only
MT6757D (Z1, Z1 Pro, S, S2 Pro): 7.0 only
MT6797X (Z, Z Pro): 6.0 and 7.1
Flagship models in the list above: Super, Plus, Plus E, Z1 Pro, S2 Pro, Z, Z Pro.
Each flagship model received Android upgrade if that was technically possible.
Sometimes even lower value models receive such upgrades like the MAX in the past or as the S2 Lite will in the future."
Have a nice day! 
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