Hi! I'm sorry to hear about the trouble you're experiencing with your MXQ PRO 4K. Don't worry, I'll try my best to help you out.
First, let's address the error message you're receiving. The "E: Failed to mount cache/recovery/last_locale" and "E: Failed to mount cache" errors typically occur when the device is unable to mount the cache partition. This can happen due to various reasons, such as a corrupted cache partition or a problem with the operating system files.
To resolve this issue, you can try the following steps:
1. Power off your MXQ PRO 4K completely by unplugging it from the power source.
2. Once it's powered off, press and hold the reset button located on the back or bottom of your device. While holding the reset button, plug the device back into the power source.
3. Continue holding the reset button for about 10-15 seconds until you see the Android logo or a recovery menu appear on your screen. Release the reset button.
4. In the recovery menu, use the volume buttons to navigate and the power button to select options. Look for an option that says "Wipe cache partition" and select it. Confirm the action when prompted.
5. After the cache partition is wiped, go back to the main menu of the recovery and select the option to "Reboot system now." This should restart your device.
If the boot loop issue persists after performing these steps, you may need to consider performing a factory reset. However, please note that a factory reset will erase all data on your device, so make sure to back up any important files before proceeding.
To perform a factory reset, follow these steps:
1. Repeat steps 1-3 from the previous instructions to access the recovery menu.
2. In the recovery menu, look for an option that says "Wipe data/factory reset" and select it. Confirm the action when prompted.
3. Once the factory reset is complete, select the option to "Reboot system now" to restart your device.
If the issue still persists after a factory reset, it's recommended to contact the manufacturer or seek professional assistance for further troubleshooting or repairs.
I hope these steps help resolve the issue with your MXQ PRO 4K. If you have any further questions, feel free to ask. Good luck!