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SourajitSen
Beginner Level 2

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After last update my samsung m21 is lagging too much and i can't even play a game , and my battery draining too much , if i charge it 90 % on 9.00 am it drain to 50 % on 12.00 p.m . i use my phone moderately. my screen on time about 7 hrs in average....
When samsung m21 would get one ui 4.0 update ??
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