The situation when a car owner cannot use the multimedia system due to a forgotten password occurs quite often. This can happen after buying a used car, resetting the settings, or simple human forgetfulness. Chinese radios based on Android, such as Teyes, Podofo or Eonon, often have different protection methods, from a simple pattern key to a complex service PIN code.
Restoring access to the head unit requires understanding operating system architecture and specifics of a particular model. There is no single magic “Reset” button that would suit every device without exception. However, there are a number of proven algorithms that allow you to bypass the screen lock or remove the password prompt when the system boots.
In this article we will analyze in detail all the available methods: from a soft reset through settings to hard methods using the engineering menu. It is important to act consistently, starting with the safest options, so as not to turn a working radio into a “brick.”
Standard unlocking methods through the interface
The most obvious, but often ignored method is to try to remember the code or use the recovery function built into the system. Many modern models on Android 8.0 and higher link the unlocking to Google account or allow you to reset the password after several unsuccessful attempts to enter.
If you see a message about blocking for a certain time, do not try to guess the code endlessly. This may result in the device being completely locked for a long period of time or requiring you to enter a master code that is known only to the manufacturer. Try entering standard combinations, which are often set by default at the factory.
⚠️ Attention: Entering the wrong service code more than 3-5 times can lead to irreversible locking of the bootloader. Be extremely careful when trying to select numbers in the engineering menu.
Try the following universal combinations, which often work on devices without deep customization:
- 🔢 0000 or 000000 —the basic code for many budget models.
- 🔢 1234 or 123456 — often used as a demo password.
- 🔢 8888 or 1617 —specific codes for some Chinese firmware.
- 🔢 126 or 3368 —codes for entering the engineering menu, from where you can reset the settings.
Before entering codes, write them down on paper. If one does not work, you will know exactly which options have already been tried and will not get confused in the numbers.
Reset to factory settings (Hard Reset)
If the standard codes do not work, the only software solution is a complete system reset. This procedure will delete all user data, including saved navigation maps, pairs Bluetooth and music playlists, but will restore access to radio control.
This can be done in two ways: through the Recovery menu or through the hidden engineering menu. The first option is more secure, since the system itself controls the process of cleaning memory partitions. To enter Recovery, you usually need to physically press the device buttons when you turn it on. Hard Reset can be done in two ways: through the Recovery menu or through the hidden engineering menu. The first option is more secure, since the system itself controls the process of cleaning memory partitions. Entering Recovery usually requires physical pressure on the device's buttons when turned on.
☑️ Preparing to reset the settings
On many models, such as Joying or Xtrons, the reset button (Reset) is displayed on the front panel or is located in a small hole next to connector MIC or SD. Pressing this button with the ignition on initiates a reboot, clearing the cache and data.
If there is no physical button, try the software method. Go to the date and time settings, then quickly click several times on the version Android or build number. This may open a hidden menu where the Factory Data Resetoption will be available. Remember that after this procedure the radio will look as if you just took it out of the box.
What to do if the Reset button does not respond?
If pressing the reset button does not produce a result, it may be software disabled or faulty. In this case, you will need to remove the radio and close the contacts on the board or use ADB commands via a computer.
Using the engineering menu and service codes
The engineering menu is a powerful tool for diagnosing and configuring hidden parameters Android radios. This is where the function for removing a forgotten password or pattern is often stored. Access to this menu is protected by a special password, which differs for different chipsets (Rockchip, Allwinner, MEDIATEK).
To enter the menu you need to open the "Factory settings" application (Factory Settings) or "Car settings" (Car Settings). The system will ask for a password. If you do not know it, try find a sticker on the device case or in the documentation - sometimes the code is printed there.
| Manufacturer / Chipset | Service code | Purpose |
|---|---|---|
| Universal Android | 126 | Entering factory settings |
| Rockchip PX3 / PX5 | 8878 | Reset screen password |
| MEDIATEK (MTK) | 1617 | Engineering menu |
| Teyes / Eonon | 3368 | Reset all settings |
| Remote control (combination) | Menu button + "1 | Alternative login |
Once inside, look for the section Password Settings or Security. There may be a checkbox “Enable password” (Enable Password), which needs to be unchecked. Some firmware has a button Clear Passwordthat instantly deletes the current one. protection.
Service codes depend on the firmware version. If code 8878 does not work, try to find the current list of codes specifically for your version of MCU on the 4PDA or XDA forum.
Unlocking via computer and ADB
For advanced users who are not afraid to work with the command line, there is method of deleting a file with passwords through debugging USB. This method only works if the “USB Debugging” option was previously enabled in the radio settings (USB Debugging).
You will need a computer, a USB cable type Male-to-Male (both ends like a regular flash drive) and an installed package Android SDK Platform-Tools. Connect the radio to the PC, wait for the drivers to be installed and check the connection.
adb devicesIf the list displays a device with status device, then the connection is established. Next, you need to delete the files responsible for storing the lock keys. Enter the following command:
adb shell rm /data/system/gesture.keyIt is also worth deleting the file locksettings.db, if the first method did not work. After executing the commands, reboot the radio. The next time you turn it on, the system will not find the file with the password and will let you into the menu without asking for a code.
⚠️ Attention: This method will not work on devices with an encrypted data section if you have not entered the password at least once after turning on the power. decryption to the user code.
Reflashing the radio as a last resort
If none of the software methods helped, a radical option remains - completely reflashing the device. This is guaranteed to remove any password, but carries risks. Incorrectly selected firmware can lead to incorrect operation of the touch screen, loss of sound or complete failure of the device.
The process begins with accurate identification of the model. Remove the radio from the panel and look at the sticker on the back. You need information about the processor (CPU), amount of RAM (RAM) and version. MCU. You need to download the firmware strictly according to these characteristics.
The firmware file usually has the extension .img or .update. It must be written to a blank flash drive with a capacity of up to 16 GB, formatted in the file system FAT32. Insert the drive into the port USB 1 (often it is highlighted in color) and reboot the device.
The system will automatically detect the update file and prompt you to begin installation. This process may take from 10 to 30 minutes. It is critical not to remove the flash drive or turn off the car engine during the update, otherwise the board may come out. out of order.
Where to look for firmware?
Official websites of manufacturers are often closed or out of date. The best source is specialized threads on the 4PDA forum, where enthusiasts post modified firmware with bug fixes and Russification.
Hard reset and physical methods
In the most difficult cases, when the system does not boot or is locked at the bootloader level, physical intervention is required. This may involve shorting certain contacts on the board or temporarily disconnecting the internal memory battery.
Many Chinese radios have a small coin cell battery (CR2032) or capacitor that powers the settings memory when the ignition is turned off. If you turn off the vehicle's power and wait 15-20 minutes (or briefly close the CMOS reset contacts), the settings may return to factory settings.
To implement this method, you will need to disassemble the device case. Find contacts on the board labeled CLR_CMOS, JB or just two contacts next to the battery. Short them with a metal object for a few seconds with the power off.
⚠️ Attention: Disassembling the device often voids the warranty. If the radio is new, it is better to contact the seller's service center rather than try to close the contacts yourself.
After assembly and connection, check the operation of the system. If the password has disappeared, but the time or radio station settings have disappeared, it means the reset was successful. You will have to configure the radio again, but access to the functions will be restored.
When disassembling, take photographs of each stage of unscrewing the screws and disconnecting the cables. This will help you put the device back together without unnecessary parts and connection problems.
Prevention and security tips
To prevent the situation of a forgotten password from happening again, it is recommended to change the approach to setting up security. Do not use complex combinations that are easy to forget, but also do not leave the device completely unprotected if important data is stored on it.
Write down the set password in a safe place: in a notepad with car documents or in a password manager on your smartphone. It is also useful to create a backup copy of the settings if the radio firmware supports such a function via the cloud or SD card.
Update the software regularly. Manufacturers often release patches that improve stability and add functions for restoring access through a linked email or account. Follow the news on specialized resources.
Use high-quality power sources. Voltage surges in the vehicle’s on-board network can cause memory failures, which can cause the system to “forget” the password or, conversely, become locked. Installing a voltage stabilizer for the radio can prevent such problems.
What to do if the radio requires a password every time you turn it on?
This is a sign of a failure in the firmware or a dead internal battery. Try performing a hard reset. If the problem does not go away, you will need to reflash the device or replace the battery on the board.
Is it possible to unlock the radio via an application on your phone?
Only if a special control application is installed on the radio (for example, Teyes Link or ZLink) and Debugging is enabled. It is usually impossible to unlock a Chinese radio through standard applications like “Find Device”.
Will disconnecting the car battery terminal reset the password?
In 90% of cases, no. The password is stored in non-volatile memory (Flash/eMMC). Turning off the power only resets the current time and radio settings, but does not delete the screen lock file.
Where can I find the service code for my specific radio model?
Try entering the universal codes (126, 8878, 3368). If it doesn’t help, look for the device model on the 4PDA forum in the “Car radios on Android” section. Often in the topic header there is a list of codes for different versions of the MCU.
Is it safe to use third-party firmware to reset the password?
This is always a risk. Third-party firmware may not fit your hardware (screen, sound, CAN bus). Use them only if other methods have been exhausted and you are ready for possible repair of the device.