How to pass the ''Unknown Error'' code in Play store!
Sometimes when you are trying to install or update some apps from Play Store, occurred some error like :error 921 ''can't download or update app", ...
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HTC One comes with Ultra Sensor camera technology. The rear camera is 4MP and the front one is 2MP. To use the primary and activate front camera on HTC One do as follows:
1. Open "Camera" App
2. Tap the three dot icon on the top left (On landscape mode, on bottom left)
3. The first option is to change the active camera
4. Toggle between Front and Main