| Error | Solution | | :--- | :--- | | "Couldn't sign in" | Google temporarily banned your IP. Switch Wi-Fi networks or use a mobile hotspot. | | "TalkBack won't turn off" | Ask Google Assistant: "Turn off TalkBack." | | "Browser won't download APK" | Clear cache via Settings > Apps > Chrome > Storage . | | Device freezes on boot | Hold Power + Volume Down for 15 seconds to force reboot. | | "No OTG support" | The K87CA does support OTG usually. If not, use a Bluetooth mouse. |
: Applications like Wondershare Dr.Fone claim to remove ZTE FRP locks using a PC, provided the device has a compatible MediaTek CPU (though the K87CA often uses a Qualcomm Snapdragon 215). zte k87ca frp bypass