Speed up the galaxy S4 and enable the developer mode


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Nov 9, 2014
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i recently buy a mobile which runs on android 4.4.2. i enabled developer option.i have 2 peace of that phone.1 is in normal mode another is in developer mode.i updated Google maps in both mobile. google map 9.0 version downloaded in developer mode mobile and google map version 8.4 downloaded in normal phone. 9.0 version is not available on play store. is this normal? is it caused because of developer option? developer option is harm full for mobile?