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The Nokia 105 (RM-908) does not have a native Micro-USB port for data transfer or charging like newer models; it uses a proprietary 2.0 mm charging connector. To perform flashing or software repairs, you must use the FBUS test points located on the PCB behind the battery. RM-908 FBUS / USB Pinout Guide
When connecting the phone to a flashing box (like Infinity-Box or Advance Turbo Flasher) using a modified USB cable, follow this pin configuration: Pin 1 (VBAT): Battery Positive (+) Pin 2 (TX): Data Transmit Pin 3 (RX): Data Receive Pin 4 (MBUS): Combined data line Pin 5 (GND): Ground / Battery Negative (-) Draft Post: Nokia 105 (RM-908) Flashing & USB Pinout
Headline: 🛠️ Service Tip: Nokia 105 (RM-908) USB & FBUS Pinout for Flashing
Need to unlock or flash a classic Nokia 105 RM-908? Since this model lacks a standard USB port, you'll need to use the hidden test points on the PCB. Pinout Configuration: VCC / VBAT: Power Supply (+) TX: Transmit Data RX: Receive Data MBUS: Control Line GND: Ground (-) Pro Tips:
Code Reset: If the phone is locked, the default security code is usually 12345.
Hard Reset: You can often trigger a factory reset by entering *#7370# or *#7780# if the phone still boots.
Hardware Check: If you are dealing with a "Not Charging" issue, check the charging jumper ways near the 2.0 mm jack.
#Nokia105 #RM908 #MobileRepair #USB_Pinout #Flashing #GSMRepair #TechTips Nokia 105 user guide: Keys and parts - HMD
(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. Nokia 105 Rm 908 Usb Pinout
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. The Nokia 105 (RM-908) does not have a
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.
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.
Finding the correct USB pinout for the Nokia 105 RM-908 is essential if you are trying to connect the phone to a computer for flashing or repair because this model does not have a standard USB charging port.
Here is the complete guide for locating and using the USB pinout.
This report details the hardware pinout configuration required to establish a USB connection for the Nokia 105, model designation RM-908. This specific model utilizes a proprietary pad layout on the main PCB (Printed Circuit Board) for flashing, servicing, and data transfer. Accessing these pins requires opening the device casing, as the standard consumer interface does not utilize a traditional USB port.
A: No. Most modern cables leave pin 4 floating. You need a cable with pin 4 tied to ground, or use the original Nokia charger (which internally shorts ID to GND).
| Symptom | Possible Cause | |---------|----------------| | No charging | Damaged Pin 1 or 5 on the phone’s port; broken PCB trace; faulty micro-USB socket. | | Phone shows “USB Connected” | D+/D- lines are shorted to GND or VBUS – should not happen unless port is dirty or damaged. | | Overheating while charging | Incorrect charger wiring or short between VBUS and GND. |
To enter flashing mode (using Nokia’s proprietary tools like Phoenix Service Software or ATF Box), both D- and D+ need specific connections, usually via a USB-to-serial converter or a "USB to UART" adapter.
Wiring for flashing / emergency recovery: Warning: Direct connection of D+/D- to PC USB
| Micro-USB Pin | Connection | Purpose | |---------------|------------|---------| | Pin 1 (VBUS) | +5V from USB (optional, can power via battery) | Power | | Pin 2 (D-) | TX (UART transmit from phone) | Firmware debug | | Pin 3 (D+) | RX (UART receive to phone) | Firmware upload | | Pin 4 (ID) | GND (pulled low) | Enable mode | | Pin 5 (GND) | GND | Common ground |
Warning: Direct connection of D+/D- to PC USB data lines will not work. You need a level shifter (3.3V to 5V) or a USB-to-TTL converter (e.g., PL2303, CP2102). The RM-908 uses 2.8V logic on D+/D-.
On the RM-908 motherboard, look for a small square pad labeled "TST" (Test) or "POINT6" near the SIM holder.
To force emergency mode:
Note: This requires specific software (Phoenix Service Software, JAF, or Infinity) and a valid flash file.
After analyzing the motherboard schematics (available from service manuals) and practical reverse-engineering by repair communities, here is the verified pinout for the Nokia 105 RM-908 micro-USB port.
Looking into the micro-USB port on the phone (pins facing up, from left to right):
| Pin Position | Pin Name | Connection to Nokia 105 RM-908 | Voltage / Signal | |--------------|----------|--------------------------------|-------------------| | 1 (leftmost) | VBUS | +5V charging input via PMIC | 5V nominal | | 2 | D- | No direct connection. Connected to test points (TP-51) for flashing. | High-Z or ground via resistor | | 3 | D+ | Connected to ESD protection diode, then to CPU (UEM) for flashing mode. | 0V or 3.3V logic | | 4 | ID | Critical pin – Connected to a 10kΩ pulldown resistor to GND, also to charger detection circuit. | ~0V when cable plugged. | | 5 (rightmost) | GND | System ground | 0V |