How to enable Greyscale mode on any android like samsung S5 UPSM ( ultra power saving mode)
this video is to teach you how to make your android into greyscale mode like samsung S5 UPSM or ultra power saving mode to save your battery ,, and if u wanna make it save more battery try this : settings --- developer options --- apps --- turn on these three : 1.dont keep actives, 2.background process limit, 3. kill app back button.