Why Xiaomi Redmi Note 9 is turned on for a long time - all the reasons and ways to eliminate

Xiaomi Redmi Note 9 is one of the most popular budget smartphones, but even it is not immune to loading problems. MI It doesn't always mean that you're going to have a major failure, or you're going to reboot it in a cycle, and 80 percent of the time, it's software failures that you can fix without going to the service center.

In this article, we’ll look at all the possible causes of slow boot Redmi Note 9 — from overcrowded memory to hardware malfunctions, learn how to distinguish a software failure from a physical failure, what manipulations to try first, and when to take risks and take the phone to repair. We also collected step-by-step instructions with illustrations and warnings about typical user errors.

Special attention will be paid to the unique feature of the Redmi Note 9: its memory controller UFS 2.1 is sensitive to overheating and unstable stress, which often causes "hangs" during the initialization stage of the system. This nuance is rarely mentioned in standard manuals, but it is critical for diagnosis.

1. Memory overload: When the phone "chokes" in data

The most common reason for long switching on is a lack of free space in internal memory.Redmi Note 9 fitted 64/128 GB storage, but even this may not be enough if:

• 📷 More than 5,000 photos are stored in the original resolution (each takes 5-10 MB)
• 🎵 I have offline playlists in my memory. Spotify/Yandex Music (1 album = ~100 MB)
• 🎮 Installed heavy games (Genshin Impact – 4 GB, Call of Duty Mobile – 2 GB)
• 🗑️ App cache hasn't been cleared for more than 6 months (can take up to 15GB)

When filling in memory at 90%+ The system starts fragmenting the data, which increases the read time when it loads. < 1GB phone can freeze during file system check (fsck).

Remove duplicate photos through Google Photos

Transfer music to a memory card (if available)

Clear the cache in Settings → Warehouse → Clean up

Remove unused items APK through settings → Annexes

Disable automatic media saving from messengers-->

⚠️ Note: Do not use Google Play's "memory cleaners" (such as Clean Master or CCleaner).They often delete important system files, which can aggravate the problem. → Cleanup.

2. firmware failures: when the system "breaks" after an update

Redmi Note 9 gets its latest official update MIUI 14 in 2023, but many users still face issues after updates.Typical symptoms of damaged firmware:

• 🔄 The phone is rebooted cyclically (bootloop)
• 🐢 Hanging on the logo MI 5 minutes
• ⚡ Sudden shutdowns when charging
• 📱 Black screen with backlight after update

Causes of firmware failure:

🔧 Instructions for firmware recovery:

1. Download the official firmware for Redmi Note 9 (codename merlin) from en.miui.com.
2. Unpack the archive and move the update.zip file to the root of the phone’s memory.
3. Press Volume Up + Power to enter Recovery.
4. Select Install update.zip and confirm the installation.

3.Battery problems: when the battery 'cheats' the system

If the Redmi Note 9 only lasts for a long time when the charge is low (less than 15%) or after a complete discharge, the problem is most likely the battery. BQ25601D in this model is sensitive to:

• 🔋 Deep discharge (below) 3.2V)
• 🌡️ Overheating over 45°C
• ⚡ Non-original chargers
• 🔄 Frequent charging cycles (more than 500)

📊 How to check the status of the battery:

1. Enter the code ##4636## in the phone application.
2. Go to the Battery Information tab.
3. Check Health Level: Good: 90–100% Mean: 80–89% (may cause slow loading) Bad: below 80% (requires replacement)

⚠️ Warning: If the phone only turns on when connected to a charge, but immediately turns off after disconnection, this is a sign of complete wear and tear of the battery.

Every night.

1-2 times a week

Only in emergency cases.

I never get to full discharge.-->

4. Hardware malfunctions: when the "iron" is to blame

If all software methods have been tried, but the Redmi Note 9 is still a long time to turn on, it is worth considering physical breakdowns.

🔍 How to Diagnose a Hardware Problem:

1. Check charging response: If the phone vibrates when the cable is connected but does not turn on, the problem is with the power controller.
2. Listen to sounds: A snap or crackle when turned on indicates a motherboard malfunction.
3. Inspect the case: Bloating the back cover (especially in the area of the camera) indicates the bloating of the battery.
4. Check the heating: If the bottom of the phone gets very hot when turned on, the Helio processor may fail G85.

💡 Tip: If you suspect a hardware malfunction, don't try to disassemble the phone yourself.The Redmi Note 9 has a glue display, and a careless autopsy can damage the plumes.

💡

Before visiting the service, make a backup copy of the data via Mi PC Suite, even if the phone doesn't turn on. Sometimes experts can extract data directly from memory through the phone. ISP-programmer.

5. Conflicts with applications: when the software is to blame

Some applications may block system boot if they:

• 🛡️ Administrator rights (antiviruses, VPN)
• 🔄 Start at the start of the system (messenger, launchers)
• 📦 Use non-standard permissions (for example, SYSTEM_ALERT_WINDOW)
• 🐞 Contain errors in the code (beta versions of applications)

🔎 How to Find a Problem App:

1. Load your phone in Safe Mode (clip Power, then hold down Power Disconnect until the prompt to go to Safe Mode appears).
2. If the phone turns on quickly in safe mode, one of the installed applications is to blame.
3. Remove suspicious programs (start with the latest ones installed).
4. Check the autoload list in Settings → Annexes → Auto-start.

⚠️ Attention: Conflicts are especially common:

• Parallel Space (Creating a Virtual Environment)
• Greenify (aggressively optimizing processes)
• Any modified ones APK (Spotify Premium or YouTube Vanced)
• root-access applications (e.g. Titanium Backup)

6.Overheating and its effect on loading

Redmi Note 9 is powered by MediaTek Helio processor G85, prone to overheating because of:

• 🌞 Uses under direct sunlight
• 🎮 Long play sessions (PUBG Mobile, Free Fire)
• 🔋 Fast charging (especially non-original adapters)
• 🧊 Pollution of vents by dust

Overheating over 50°C activates thermal throttling, which is an artificial decrease in performance. (60)°C+) phone:

• 🐢 Slow down the load to 10-15 minutes
• ⚡ Turn off immediately after switching on
• 🔄 Cyclically reboot

📉 How to check the temperature:

1. Install the AIDA64 or CPU Monitor app.
2. Check the processor temperature to simple (normal: 30-40)°C).
3. If the temperature is above 45°C without load - cleaning is required.

🛠️ How to eliminate overheating:

• 🧹 Clean the charging connector and vents with compressed air.
• 🔌 Use only the original adapter 22.5W (model MDY-11-ED).
• 📴 Turn off the background activity of applications in Settings → Battery → Optimization.
• 🧊 In extreme heat, put your phone in the refrigerator (in a bag!) for 10 minutes.

💡

If the phone overheats even in plain, it may indicate a malfunctioning heat paste between the processor and the case. MX-4 or similar.

7. Recovery through EDL: last chance before the service

If Redmi Note 9 does not turn on at all (black screen, no reaction to buttons), but the computer identifies it as Qualcomm HS-USB QDLoader 9008 means the phone is in mode EDL (This is the last chance to restore it without replacing components.

🔧 What's the matter:

• 🖥️ Windows computer 10/11
• 🔌 Original. USB-cable (quality contact is important)
• 📥 Firmware for Redmi Note 9 in.mbn format
• 🛠️ Mi Flash Tool or QFil

⚠️ Attention: Firmware through EDL If your phone had important files, try extracting them first through Chip-Off (requires specialized hardware).

📌 Step-by-step instruction:

1. Download and install Qualcomm drivers USB from qcomdriver.com.
2. Connect the phone off to the PC, keeping Volume up + Loudness down.
3. Device Manager should have a device QHSUSB_BULK.
4. Start the Mi Flash Tool, select the firmware and press Flash.
5. Wait for the end (10-15 minutes) and the phone will reboot automatically.

FAQ: Answers to Frequent Questions