how do i reinstall missing applications like pictures, file manager etc
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Where did you get 10.3.1.634? (What link address?) How did you install it?
@Kelebogile, what type of device is there? Is it Android/ iOS/ Windows/ Blackberry OS? If it is Blackberry, then what make/ model is it? What happened before that you lost all of them on your phone? Please provide more details.
@Kelebogile, what type of mobile is there? What OS is on your mobile? What make/ model of your handheld device? Please provide more details.
Please ink here for BB Q10 support, https://hard-resets.com/blackberry-q10-hard-reset/