(specifically the model) is a classic feature phone released in 2013. Unlike modern iterations of the Nokia 105 that feature standard micro-USB or USB-C ports, the original
relies on a proprietary 2.0 mm charging pin and does not have an external USB port for data transfer or flashing.
To perform data-related tasks like firmware flashing or security code bypassing, technicians must use internal USB pinouts located on the phone's Printed Circuit Board (PCB). Core Components of the Pinout Because the
lacks a standard USB interface, "pinout" refers to specific test points (jumpers) on the motherboard. For communication with a PC, a modified USB cable or a specialized interface box (like Advance Turbo Flasher) is used. The standard pinout for this model typically follows a 4-wire configuration:
VCC/VBUS (+5V): The power supply line, typically connected to the battery positive terminal or a dedicated power test point.
GND: The ground connection, which can be any metal shielding or the battery negative terminal.
Data+ (D+) and Data- (D-): These are the critical communication lines. In the RM-908, these points are often found near the CPU or charging port area on the PCB. Technical Applications
Connecting to these pinouts is primarily done for two reasons:
Charging Repair: If the 2.0 mm pin connector is damaged, technicians use these pinouts to "jump" the power connection directly to the board. Software Servicing: The
frequently requires a "Hard Reset" via flashing if the security code (default 12345) is lost and the manual battery-drain method fails. Safety and Requirements
Qualified Service: HMD and Microsoft (former owners of the Nokia brand) emphasize that hardware-level repairs should only be performed by qualified personnel to avoid permanent electrical damage.
Software Tools: Successful connection via pinout usually requires the Nokia Connectivity Cable Driver or Nokia PC Suite to ensure the computer recognizes the device as a COM port. Nokia 105 Rm 908 Usb Pinout
For users with modern versions of the Nokia 105 (such as the TA-1465 or 4G models), the process is simplified as they include a functional micro-USB port that supports both charging and direct data connection to a PC.
On the RM-908 board, the test points are often arranged vertically near the bottom edge:
Standard USB cables have four wires. Here is how they map to the Nokia 105 RM-908 motherboard:
| USB Wire Color | Function | Connection Point on Nokia 105 RM-908 | | :--- | :--- | :--- | | Red | VBUS (+5V) | Connect to the VBAT (Battery Positive) terminal or the +5V input at the charging connector. | | Black | GND (Ground) | Connect to the GND (Battery Negative) terminal or any metal shielding. | | Green | D+ (Data Plus) | Connect to the USB D+ test point on the PCB. | | White | D- (Data Minus) | Connect to the USB D- test point on the PCB. |
If the device is connected but not recognized by the PC:
Disclaimer: This report is for educational and hardware repair purposes only. Interfering with device hardware carries a risk of permanent damage. Always ensure you have the correct firmware files specific to the RM-908 variant before attempting to flash.
The Nokia 105 (RM-908), released in 2013, remains a staple for reliability and simplicity. However, unlike modern feature phones that use standard Micro-USB or USB-C ports, the original RM-908 relies on a 3.5mm AV-style charging port and a proprietary internal interface for data and flashing.
Understanding the pinout is essential for technicians performing firmware updates, unlocking security codes, or repairing charging paths. Internal Data and Flashing Pinout
Because the Nokia 105 RM-908 lacks an external USB data port, flashing and unlocking must be done via the F-Bus interface located on the motherboard. Technicians typically use a JAF, ATF, or Infinity BEST dongle connected to these specific test points: VPP: Programming voltage. TX: Transmit data. RX: Receive data. GND: Ground.
BSI: Battery Size Indicator (used to put the phone into "Test" or "Local" mode). Connection Point VBUS (+5V) Power input for charging Near the 3.5mm jack contact GND System Ground Any metal shield or battery negative BSI Local/Test Mode trigger Middle pin of battery connector RX/TX Data Transfer Internal motherboard test pads Charging Path and Jumper Solutions
If your RM-908 is not charging, common hardware solutions involve bypassing faulty components with jumpers. Nokia 105 (2023) User Guide - HMD (specifically the model) is a classic feature phone
Nokia 105 (RM-908) does not feature an external micro-USB port for data transfer or charging like modern smartphones. Instead, its "USB pinout" refers to test points (TP)
or pads on the motherboard used for flashing firmware or repairing charging circuits USB and Charging Pinout Details
For technicians performing hardware repairs or flashing firmware (often using tools like Infinity BEST), the following connection points are used: Vcc (5V+):
Typically a larger pad near the battery connector area or directly traced from the charging port pins. Data+ (DP):
Often marked as a specific test point on the circuit board, usually colored green in technical diagrams. Data- (DM):
A corresponding test point for data communication, often colored white in schematics. Ground (GND):
Connected to the common ground of the motherboard, typically indicated by yellow markers on large copper pads. Flashing and Repair Use Cases Charging Issues:
If the standard charging port fails, jumpers can be soldered directly to these pinout points to restore power. Security Code Reset:
lacks a standard USB interface, flashing the device through these motherboard test points is often the only way to reset a forgotten security code Software Repair:
For "dead" phones or auto-restart issues, a specialized flash interface or "F-bus" cable is connected to these points to reload the operating system. General Device Codes
If the hardware connection is successful, you may need these default codes for software-level tasks: Default Security Code: Factory Reset Command: on the home screen to restore original settings. Mobile Master Visual PCB Reference On the RM-908 board, the
For detailed visual guides on where to place jumpers, refer to technical resources like the Nokia 105 Charging and USB Pinout Video or schematic layouts on of the motherboard or help with a flashing error Codes for Nokia phones - Mobile Master
Reset all settings, then enter the special code (12345 by default). Mobile Master Nokia 105 User Guide: Restore factory settings - HMD
If you’ve flashed a corrupt firmware (e.g., via Infinity Box or MX Key), the phone may be dead. You need to enter emergency download mode using the USB pinout plus a hardware test point.
Step 1: Disassembly
Step 2: Locating the Pins
Step 3: Wiring (Jumpering)
Step 4: Software Recognition
Q1: Can I charge a Nokia 105 RM-908 with just two wires (red and black from USB)? A: Yes, absolutely. The phone does not require data negotiation to begin charging. Simply connect +5V to VBUS and GND to GND.
Q2: My USB port is destroyed. Can I solder directly to the battery terminals? A: Technically yes, but do not do this. Batteries require a CC/CV charging algorithm. Bypassing the charging circuit can cause the battery to overheat, swell, or explode. Always solder to the test points (TP701/TP702) which are after the protection IC but before the battery management.
Q3: What is the maximum charging current via the USB pinout? A: The internal charger IC on the RM-908 is limited to 450-550 mA. Using a 2A charger will not damage the phone; the phone will only draw what it needs.
Q4: Can I use a Nokia CA-189 USB cable? A: The CA-189 is a charging-only cable (no data lines). It has a standard micro-USB pinout (only pins 1 and 5 connected). It will work perfectly for charging the RM-908.