How to solve the problem when install butten is not working cancel btten is working

first step reset your mobile .before reseting backup your data.try one to two times .still playstore not working means simply install apps via APK files

Follow these steps:

1)install app Backup &restore application in friends mobile.
2)click backup of required application and it will save into file manager .
3)goto file manager and send via any file transfer techinque simply bluetooth
4)install application in your phone

Do not use your phone after losing data. Any new data written into your phone might overwrite your lost Whatsapp messages.
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Hi,
The following steps should remove the privacy lock on your sidekick: 1. Remove Simcard
2.press And Hold the Letter "r"
3.place Battery Into Phone While Holding The Letter "r"
4.wait Until You See The 4 Icons Appear On The Screen
5. Remove Your Finger From The Letter "r" And Let The Phone Re- Boot
6. Place Your Sim Into The Phone
Hope this helps, Joe