After you get to the options that you told us, you have to hold on the option that says Power off until a dialog appears.
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Re: When i will get official lollipop update for my unite 2
If whatever you are talking about is a locked phone, then your carrier needs to make their own version of Lollipop so the carrier apps will work properly after the update.
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To get the developer options, you have to go to About Phone and rapidly tap Build Number until it says "You are now a developer!" And then, you can go out of About Phone to find Developer Options.
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