Tips and tricks to fix REALME 9 4G (RMX3521) problems. This phone does not have 5G connections because it is use Qualcomm SM6225 Snapdragon 680 4G processor. We can use 4G LTE for broadband Internet access. We can use this phone for playing games because it has dedicated GPU (graphic processor unit) Adreno 610.

The first operating system installed with Android 12 together with Realme UI 3.0. The screen use Super AMOLED 6.4 inches with 90Hz refresh rate, full hd+ resolution at 1080 x 2400 pixels. The screen is protected with Corning Gorilla Glass 5 for scratch resistance. We will give more solutions for solve REALME 9 (RMX3521) troubles at community.


What are Advantages of REALME 9 Specifications and Features?

  • Network GSM 3G HSDPA or 4G LTE Dual simcard
  • LCD 6.4 inches 20:9 aspect ratio FHD Resolution + 90Hz
  • Processor Octa-core 4×2.4 GHz Kryo 265 Gold & 4×1.9 GHz Kryo 265 Silver
  • GPU Adreno 610
  • Bluetooth / GPS / Wifi
  • Memory Internal 128 GB
  • RAM 6 GB or 8 GB
  • Main Camera Triple 108 MP f/1.8 + 8 MP f/2.2 + 2 MP f/2.4
  • Main Camera Features autofocus, LED flash
  • Front Camera 16 MP for video conference and selfie photography
  • Operating System Android 12
  • Battery Li-Po 5000 mAh



How to Fix or Problem Solving for Recovery REALME 9 hang or not responding or malfunctions or stuck or freezing or bricked ?

Please note, there are several version of REALME 9, but this phone is 4G version that powered by Qualcomm SM6225 Snapdragon 680 4G processor. It has 128 GB internal storage with dedicated external memory slot for MicroSD. There are many games and applications that we can download from Google Play Store, but we have to read many user reviews before install new or not famous apps. Why?

Because some bad developers created fake games and apps, but they may contain viruses or malware or threat that can stolen our data or install unknown applications without any notifications. Our REALME 9 (4G) also can get some troubles like become hang or getting slowly or stuck or broken or frozen or LCD touch screen not responsive. These kind of apps will not get Verified by Play Protect information / icon.

To solve this problems, we need to clean temporary files and caches inside this phone. We also have to remove or uninstall suspected applications that may have viruses or malware. We need to install recommended antivirus on our REALME 9 like Avast or Norton. This applications will scan all installed apps and give recommendation for our bad or high risk setting. When some troubles still happen, then we have to do hard reset or reformat our phone to factory default.

We have to know that all data will be wiped or removed after finish performing hard reset. All Google account will be removed or deleted from REALME 9. Please do not install any APK files from unknown resources for safety reasons.


How to Force Shutdown or Force Soft Reset or Reboot or Restart REALME 9 ?

REALME 9 (RMX3521) has two options of RAM with 6 GB or 8 GB. Some installed applications may crash or corrupt. At this time, our REALME 9 will get hang or stuck or frozen or LCD screen not responsive. We have to force shutdown or force soft reset for remove caches and temporary files.


Please and hold Power Button for several seconds until this phone turn off by itself. Continue to turn it on by press Power Button again. This process will not remove any files and installed application from our REALME 9, therefore we can do this process anytime we want.

How to clean temporary files and caches when this phone work properly? By doing soft reset or reboot or restart, the temporary files and caches will be clean up automatically. Please press and hold Power Button until pop-up menu appear on the screen, then choose Power Off / Reboot / Shutdown button.


How to backup data or Contact at REALME 9 ?

REALME 9 has MicroSD simcard slot for external memory. We can backup / copy all important files and photos or videos from phone internal memory using default Android file manager, then paste it on MicroSD external memory for backup.

We can connect this phone using USB data cable to computer. After our computer finish recognizing our phone, then we can browse REALME 9 internal storage using computer file manager. We also can use USB flash drive to connect for file transfer because it has USB OTG (on the go) option.

If our REALME 9 has already signed in with Google account, by default our contact will be synchronize in the background to Google server. Please make sure we check all contact at Google contact server using Internet browse to make sure backup is done.


Please note: These options below may not work for some devices because of firmware update version or hardware troubles or some other possibilities.

#Option 1, Hard Reset REALME 9 with software menu


  1. Turn on the REALME 9
  2. Make sure the battery is not empty
  3. Backup important data at REALME 9 because all data and applications will be erase or delete
  4. Go to Menu :  Setting 
  5. Choose Tab : General
  6. Press Backup & Reset > Restore factory setting
  7. Better to not check anything at the option if you do not want to erase data at data partition at internal memory
  8. Choose Reset phone 
  9. The REALME 9 will do the master reset process.


hard reset oppo realme 9 4g (RMX3521)

#Option 2, Hard Reset REALME 9 Factory Default using Hardware Secret Button Key

If we can not go to menu, or REALME 9 can not turn on or hang or stuck or frozen so we can not access the menu setting or nothing happen while touch the screen, then try to factory reset with secret button and hardware key

  1. Turn off the REALME 9
  2. Make sure the battery REALME 9 already full or more than 50%
  3. Press together and hold the Power Button + Volume Down Button
  4. If the Logo appear, then release the button, after that we will enter some menu
  5. Choose wipe data / factory reset using Volume Button, and press Power Button to Enter or OK
  6. The REALME 9 will continue master reset, wait for several minutes until REALME 9 start like new again.


How to Unlock or Fix or Bypass or Solutions for REALME 9 forgot password code or security lock screen pattern or pin (lost password)?

All data will be saved inside internal memory or MicroSDXC, including photos videos that shoot from triple cameras 108 megapixel for wide + 8 megapixel for 120 degree ultrawide + 2 megapixel for macro. Therefore we have to secure all important data from unauthorized people when REALME 9 (RMX3521) lost or away from us or stolen.

Fingerprint is located under display. Please do not use any additional screen protection or tempered glass because it can make fingerprint sensor less accurate. The front camera 16 megapixel also can be use for security protection as facial recognizing.

Please choose secondary protections for backup like password or pin or screen lock pattern. Why? Because after REALME 9 reboot or restart, the fingerprint or face detection will not work. However, the problems will start happen when we can not unlock this phone or forgot security pattern / password / pin or fingerprint can not work. What should we do?

The only solutions to bypass forgotten security protection or screen lock pattern or pin or password is doing hard reset or reformat using hardware button combination key like steps at #Option 2 above.

New Android OS already has FRP (Factory Reset Protection). It is important to secure our phone if stolen or lost. If some unauthorized people force hard reset, then new reformatted Android will ask to verified with previous Google account.

Please note, after performing hard reset, some version of Android still ask for password or pin or security protection. We can bypass this protection using software that installed on personal computer. If we are not sure how to do that, please ask Oppo / Realme service center for bypass protections.


Is That Any Secret Code for Doing Format REALME 9 ?

There is no secret hidden code for REALME 9 to make it back to factory default. Please do one following options above for performing hard reset.


How to Format or Erase Phone Memory at REALME 9 ?

If we want to format and erase all data from all storage, please do hard reset using menu setting like steps at #option 1 above. This process will remove any data from internal storage together with reinstall the Android operating system to factory default.


How to Make Battery of REALME 9 Stronger, Life Longer and Not Fast to Drain ?

Big battery is ready to use. REALME 9 4G (RMX3521) has 5000 mAh battery capacity. We can use this phone for one or two days. However, if we want to make the battery work more longer, then please do some adjustment like make LCD screen brightness as low as possible and disable all not use connections like GPS or Bluetooth or WiFi. NFC is not installed on REALME 9 (RMX3521).