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[Solved] Getting "Error code -507" from the Play Store and "Install failed, user restricted" when installing an APK

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eatbotan Asks: Getting "Error code -507" from the Play Store and "Install failed, user restricted" when installing an APK
I have a Chinese-branded phone from Spreadtrum. I can't install any apps both from the Play Store and APK.

Play Store gives "Error code: -507".

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Screenshot showing error code: -507 on the Play Store

Installing an APK using ADB gives "Failure [INSTALL_FAILED_USER_RESTRICTED]"

Screenshot showing install failed user restricted on ADB

There is something limiting this phone.

Is there any way to install an app on this phone?

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