v1 v2
NBG4615NBG4615 v2
Version/Model S/N OpenWrt Version Supported Model Specific Notes
v1 A ? First Version
Version CPU Ram Flash Network USB Serial JTag
v1 RT3052@384MHz 64MB 8MB 4×1 GbE 2x USB2.0 Yes ?
v2 RT6856@700MHz 128MB ? 4×1 GbE 2x USB2.0 Yes ?


Architecture MIPS MIPS 24Kec
Vendor Mediatek/Ralink
bootloader U-Boot
System-On-Chip RT3052
CPU Speed 384 MHZ
Flash-Chip ?
Flash size 8 MiB
RAM 64 MiB
Wireless Integrated RT3052 b/g/n
switch Atheros AR8316 4+1 GbE
RTC Chip ?
USB 2x USB2.0
Serial Yes




Note: This will void your warranty!

  • To remove the cover simply remove the two screws on the bottom. Then just open it.
  • The board itself has no screws.



The pin assignment is:

  1. VCC
  2. TxD
  3. GND
  4. RxD

With Pin 1 being the one closest to the LEDs. It uses 3.3V levels.



PCF8563 RTC I2C Interface

RTL8366S Switch I2C Interface

The Bootloader used in this unit is U-Boot . It is available through the serial interface with the settings: 57600/8-N-1 (flow control: none)

Emergency HTTP server IP address is Internet Explorer browser is supported.

If, for some reason, your router cannot boot any more, there is a good chance that the original bootloader is still working. To check, connect to the serial port and do router power cycle:

U-Boot 1.1.3 (Aug 30 2010 - 18:21:21)

Board: Ralink APSoC DRAM:  64 MB
relocate_code Pointer at: 83fac000

 The Flash ID =000022CB
flash bank 0 size:8388608
flash_protect ON: from 0xBF000000 to 0xBF021767
flash_protect ON: from 0xBF030000 to 0xBF030FFF
Ralink UBoot Version: EZPacket 1.6
ASIC 3052_MP2 (Port5<->GigaSW)
DRAM component: 256 Mbits SDR
DRAM bus: 32 bit
Total memory: 64 MBytes
Flash component: NOR Flash
Date:Aug 30 2010  Time:18:21:21
icache: sets:256, ways:4, linesz:32 ,total:32768
dcache: sets:128, ways:4, linesz:32 ,total:16384

 ##### The CPU freq = 384 MHZ ####

 SDRAM bus set to 32 bit
 SDRAM size =64 Mbytes

 RT3052 ASIC Setting switch.

Please choose the operation:
   1: Load system code to SDRAM via TFTP.
   2: Load system code then write to Flash via TFTP.
   3: Boot system code via Flash (default).
   4: Entr boot command line interface.
   6: To emergency.
   9: Load Boot Loader code then write to Flash via TFTP.
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  • Last modified: 2019/10/17 19:56
  • by tmomas