πŸ“ Introduction

If you’re experiencing issues with your POCO X3 Pro, especially the Indian variant (Bhima), this guide is for you. Many users have reported their devices bricking out of nowhere, particularly while charging, being idle, or during heavy gaming sessions. If you’re facing glitches, lags, random reboots, or other performance issues, calibrating your PMIC could be a solution. However, it’s essential to proceed with caution and follow each step meticulously to avoid any potential problems.

πŸ€” Understanding the Problem

The POCO X3 Pro uses the Qualcommβ„’ Power Solutions PM-8150L (PMIC) for the Snapdragon 855+/860 SOC. A buggy PMIC can cause numerous issues, including:

⚠️ Mild Symptoms:

  • πŸ“‰ Lagging
  • πŸ”₯ Overheating during basic tasks
  • πŸ”„ Random reboots

🚨 Severe Symptoms:

  • πŸ“Ί Glitchy screen (grey screen with parallel retracing lines)
  • ❄️ Frequent freezing
  • βœ‹ Touch issues
  • πŸŒ‘ Proximity and light sensor failures (intermittently every 2-3 days or even daily every 2-4 hours)

πŸ’‘ Benefits of Calibration

Calibrating your IC can:

  • πŸ”‹ Display the correct battery percentage
  • πŸ› οΈ Fix sensor issues (until recalibration is needed)
  • ⚑ Potentially resolve ESD issues in the digitizer panel (more effective in some variants)
  • πŸ”Š Improve speaker sound quality
  • πŸ”Œ Reduce the chance of battery failure if the device is allowed to drop to 0%
  • πŸ“Š Enable charging decimals to appear consistently

⚠️ Warning

You proceed at your own risk. Any outcome resulting from failure to follow these instructions carefully is your responsibility. Neither I nor this guide can be held liable for any damage, including hard or soft bricks.

πŸ“‹ Prerequisites

  • πŸ”Œ Stock charger and cable
  • πŸ“± Your POCO X3 Pro device
  • 🧘 Patience and careful reading of the instructions

πŸ› οΈ Calibration Method

  1. πŸ”‹ Drain the Battery:
    • Use your device until the battery drops to 1%.
    • When the shutdown indicator appears, plug in your device within the 30-second window.
  2. πŸ”Œ Charge to 94.50%:
    • Plug in the charger and let the device charge up to 94.50%.
  3. πŸš€ Reboot into Fastboot Mode:
    • While plugged in, force reboot into fastboot mode by pressing Volume Down + Power key.
    • Turn off the charger from the outlet (do not unplug the cable).
  4. πŸ”„ Reboot into Recovery Mode:
    • Turn the charger back on and force boot into recovery mode.
    • From recovery mode, boot into the system.
    • You should notice a different battery percentage, likely 100%.
  5. πŸ”‹ Discharge to 25%:
    • Use the device until the battery hits 25%.
  6. πŸš€ Fastboot Without Charger:
    • At 20%, force boot into fastboot mode again, but this time without the charger.
    • Repeat the process from fastboot to recovery and then to the system.
  7. πŸ”‹ Discharge to 15% and Recharge:
    • Let the battery drain to 15%.
    • Charge up to 85% and use the device normally.

⚠️ Important Recommendations

  • After calibration, only fully charge the device once every two to three weeks to avoid issues.
  • 🏠 Home Charging Rule: Maintain a 15-85% charging range.
  • 🏒 Work/Institution Charging Rule: Maintain a 20-95% charging range.
  • Calibration has been tested on stock MIUI; other ROMs are untested and may yield different results.

βœ… How to Check if Calibration Worked

  • πŸ› οΈ Sensor issues should be resolved. If problems persist, repeat the process with careful attention to the steps.
  • πŸ‘» ESD issues in the touchscreen (ghost touches) should be reduced or eliminated.
  • πŸ”Š Speakers should sound louder.
  • πŸ”₯ The device should heat up less.

πŸ” Tested Variants

  • Vayu (Global): 6GB/128GB (HUAXING) – RJUMIXM [12.5.7.0 STABLE], [13.0.3.0]
  • Bhima (Indian): 8GB/128GB (TIANMA) – RJUINXM [12.5.5.0 STABLE], [13.0.1.0]

🏁 Conclusion

Calibrating your POCO X3 Pro’s IC can resolve numerous performance issues and extend the lifespan of your device. Remember to follow each step carefully and understand the risks involved. Happy troubleshooting! πŸŽ‰

By 9M2PJU

An amateur radio operator, Royal Signals veteran, jack of all trades and master of none.

Leave a Reply

Your email address will not be published. Required fields are marked *