Modern Xiaomi and Redmi smartphones have advanced displays and sophisticated power management systems, but over time, the user may notice that the colors have faded and the battery charging readings are inaccurate. Calibration is the process of bringing equipment parameters to reference values, which is especially true after a failed firmware update or mechanical damage. Many owners confuse this process with a conventional resetting, but the real calibration affects deeper levels of MIUI and hardware.
Incorrect touchscreen, when the finger does not respond the first time or, conversely, there is a false press, often solved by software sensitivity setting. It is also worth thinking about the procedure if the phone quickly discharges immediately after removal from charging or the proximity sensor stopped extinguishing the screen during a conversation. In this article, we will discuss proven methods of restoring factory parameters for various components of the device.
Before you start taking action, you need to understand that interfering with system settings requires care. Errors in the engineering menu can lead to sensor malfunction or even software failure. Xiaomi provides users with powerful self-diagnostic tools that are hidden from the ordinary eye, but are available through special combinations.
Diagnostics of the device state through CIT-menu
The first step before any deep tuning is to accurately diagnose the current state of the components, and there's a hidden engineering module built into the MIUI shell that lets you check each sensor separately, and it's accessed through the standard Phone app, where you need to type in a special command, which is the safest way to know if your device needs calibration or if the problem is in the hardware.
To enter the test mode, dial ##6484#. If the device supports this feature, the CIT (Customer Information Test) menu will open. This list of all the modules tested, from the screen and sound to the gyroscope and NFC. Once you pass the tests, you will see the status of "Pass" or "Fail", which will give a clear understanding of which component requires intervention.
⚠️ Note: Do not change the values in the engineering menu CIT, If you are not sure about your actions, use this section only to diagnose and run automated tests.
Importantly, some global firmware versions may have limited access to full functionality, in which case the system can only offer basic tests. Advanced features sometimes require Root rights, but this deprives warranties and increases security risks.
Calibration of touchscreen and touch screen
The most common problem users face is “floating” to calibrate the touchscreen. The screen can stop responding to touches in corners or, conversely, perform actions on its own (so-called “ghost touches”). To solve this problem, Android has a hidden calibration mode available through the developer menu or special applications.
To activate debugging mode, go to Settings → About Phone and quickly click on the MIUI version seven times. Once you have become a developer, go back to the main settings menu, select Advanced Settings and find Developer Forward. Inside the menu, you need to find the option “Location of the pointer” or use third-party software for fine-tuning.
However, there is a more reliable method through the engineering menu described above: select Touchpanel or Single Point Test. Follow the instructions on the screen, swiping the specified lines. The system itself will recalculate the coordinates and reset positioning errors. If automatic calibration did not help, you may need to reset the sensor data through the ADB commands.
☑️ Checklist before screen calibration
Once the procedure is complete, be sure to restart the device. If the problem persists due to software failures in the drivers, it should disappear. In rare cases, when calibration does not help, it can be a physical wear and tear of the digitizer that requires replacement at the service center.
Setting up the proximity and illumination sensor
The proximity sensor is a critical element that turns off the screen during a conversation, preventing accidental cheek pressing. If the screen does not go out or, conversely, the conversation is constantly disrupted due to false alarms, calibration is necessary. In Xiaomi smartphones, this process is often solved through engineering menus or special codes.
Try entering the dialer code ##64663## or go to the dialer code. CIT-You can select the Proximity Sensor, close the top of the screen with your palm, then remove it, and the system should detect the change in values, and if the values do not change or jump randomly, it may be that the sensor is contaminated or closed with a poor-quality protective glass.
| Problem. | Possible cause | Method of decision |
|---|---|---|
| The screen's not going out. | Sensor contamination | Cleaning and calibration at CIT |
| Talk breaks down | False positive | Resetting sensor calibration |
| Autobrightness is not working. | Driver failure | Resetting or resetting settings |
In some cases, resetting sensor settings through the Settings menu helps. → A screen where you can try to turn off and enable the "Mode in your pocket" feature, which forcefully restarts the sensor survey with the Android system.
What to do if the sensor is closed with film?
Calibration of battery and power controller
The situation when the phone shows 15% The charge is suddenly turned off, or the charge is "stuck" on 99%, This indicates that the power controller and the software indicator are out of sync. The Li-Pol or Li-Ion battery tends to degrade, but often the problem is solved by software calibration of the file. battery_stats.bin.
There is a "full cycle method" that is safe and doesn't require superuser rights. You need to fully discharge the device before it automatically shuts down. Then, without turning the phone on, charge it to 100%. Once you reach full charge, hold it on the wire for another 1-2 hours, which will allow the controller to remember the real limits of the capacity.
⚠️ Warning: Do not leave a fully discharged phone in storage.Deep discharge below critical level can cause permanent damage to battery chemistry.
For more advanced users who have access to ADB (Android Debug Bridge, there is the option of forced deletion of the statistics file. /data/system/battery_stats.bin delete the old file, and the system will create a new one from scratch the next time it charges. This often helps when the charge indicator behaves inadequately after updating the firmware.
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Use the original charger during battery calibration. Cheap analogues can deliver unstable current, which will distort the calibration results of the power controller.
Color reproduction and display correction
Many users notice that after updating MIUI, the colors on the screen become too cold (go blue) or, conversely, excessively warm. This is due to changes in color profiles. You don't need complex codes to adjust your visual perception, just use built-in image calibration tools.
Go to Settings → Screen → Color Scheme. Standard, Saturated and Classic modes are available here. Select Advanced Settings (if available for your model) for fine-tuning. Sliders allow you to adjust the shade of red, green and blue channels to bring white to the reference value.
If the screen has uneven backlighting or a “green veil” at low brightnesses, this may be a sign of a hardware defect in the matrix that cannot be software corrected. However, including the DC Dimming feature in the Developer Menu or in the Vision Protection section can reduce flickering and improve color perception at low brightness.
Also worth mentioning is the True Color feature, which uses a light sensor to adjust the color temperature to the surrounding space. If this function doesn't work properly, try resetting the display settings through the recovery menu or simply switching the theme to the standard one to eliminate the impact of third-party interface modifications.
Resetting and restoring system settings
If none of the methods worked and the device continues to work unstable, the problem may be deep system conflicts, in which case the most effective solution is to completely reset the settings to factory settings. Be sure to back up the data before this procedure, as all the information will be deleted.
To perform the reset, go to Settings → The phone. → Resetting settings → Delete all the data. The system will alert you to the consequences. Once you reboot, the phone will go back out of the box, and all the sensor and screen calibrations will be reset to the factory values that you've written in the box_partition_ manufacturer.
In particularly difficult cases where the phone doesn’t boot or reboots cyclically, it may be necessary to flash the device through the computer using the Mi Flash Tool utility.This is an extreme measure that completely replaces the device’s software, rewriting all memory partitions, including calibration data.
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Full reset is the only way to guarantee that all sensor and screen calibrations will return to factory values without the use of sophisticated engineering software.