Zyxel NBG-419n v2, hangs during the boot

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  • Z419nv2
    New Member
    • Jan 2022
    • 3
    • Bulgaria

    #1

    Zyxel NBG-419n v2, hangs during the boot

    Hello,
    The router hangs at bootloader stage without any error. This is the log from UART:
    Code:
    U-Boot 1.1.3 (Mar 6 2012 - 17:34:10)
    
    Board: Ralink APSoC DRAM: 64 MB
    relocate_code Pointer at: 83fb0000
    spi_wait_nsec: 3c 
    spi device id: c2 20 17 c2 20 (2017c220)
    find flash: MX25L6405D
    raspi_read: from:30000 len:1000 
    .*** Warning - bad CRC, using default environment
    
    ============================================ 
    Ralink UBoot Version: 3.6.0.1_a3
    -------------------------------------------- 
    ASIC 3352_MP (Port5<->None)
    DRAM_CONF_FROM: Boot-Strapping 
    DRAM_TYPE: DDR2 
    DRAM_SIZE: 512 Mbits
    DRAM_WIDTH: 16 bits
    DRAM_TOTAL_WIDTH: 16 bits
    TOTAL_MEMORY_SIZE: 64 MBytes
    Flash component: SPI Flash
    Date:Mar 6 2012 Time:17:34:10
    ============================================ 
    icache: sets:256, ways:4, linesz:32 ,total:32768
    dcache: sets:128, ways:4, linesz:32 ,total:16384 
    
     ##### The CPU freq = 384 MHZ #### 
     estimate memory size =64 Mbytes
     uboot: NBG-419N v2 Power LED...on
    
    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. 
      7: Load Boot Loader code then write to Flash via Serial. 
      9: Load Boot Loader code then write to Flash via TFTP. 
      a: Auto load system code then write to Flash via TFTP. 
     4 
    You choosed 4
    
     0
    No matter what i choose, the result is the same.
  • stj
    Great Sage 齊天大聖
    • Dec 2009
    • 30917
    • Albion

    #2
    Re: Zyxel NBG-419n v2, hangs during the boot

    bad crc = you probably need to reflash the bootloader

    Comment

    • Z419nv2
      New Member
      • Jan 2022
      • 3
      • Bulgaria

      #3
      Re: Zyxel NBG-419n v2, hangs during the boot

      Thank you for your answer.

      Without a command line interface i can't do anything, so i see two options to reflash bootloader (I'm not a specialist):
      1. Trying with JTAG (I saw 14 holes header in PCB).
      2. Desolder the EEPROM (It's 8 pin), and reflashing it with a programmer (like CH341A).

      Any other options?

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30917
        • Albion

        #4
        Re: Zyxel NBG-419n v2, hangs during the boot

        if you can get a full-dump i'd go with desoldering the flash.
        jtag can be a pain in the ass.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30917
          • Albion

          #5
          Re: Zyxel NBG-419n v2, hangs during the boot

          it just got added to openwrt
          https://openwrt.org/toh/zyxel/nbg-419n_v2

          so you may get a dump there.

          Comment

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