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

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”.

{
“lightbox_close”: “Close”,
“lightbox_next”: “Next”,
“lightbox_previous”: “Previous”,
“lightbox_error”: “The requested content cannot be loaded. Please try again later.”,
“lightbox_start_slideshow”: “Start slideshow”,
“lightbox_stop_slideshow”: “Stop slideshow”,
“lightbox_full_screen”: “Full screen”,
“lightbox_thumbnails”: “Thumbnails”,
“lightbox_download”: “Download”,
“lightbox_share”: “Share”,
“lightbox_zoom”: “Zoom”,
“lightbox_new_window”: “New window”,
“lightbox_toggle_sidebar”: “Toggle sidebar”
}

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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