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How do you boot from usb from => mode?

  • 1.  How do you boot from usb from => mode?

    Posted 05-21-2019 19:37

    It appears the JUNOS image is missing. I have downloaded another JUNOS image from a healthy SRX240. However, I cannot figure out how to boot from USB and save the new JUNOS image from the mode I am in "=>"


    Thank you for your help,


  • 2.  RE: How do you boot from usb from => mode?

    Posted 05-21-2019 21:11

    You are in U-boot prompt. I think you pressed SPACE key during autoboot and hence you are in that prompt. Reboot the device and boot into loader prompt and then try to recover from USB:

    Reboot the device.
    The following message appears:

    Loading /boot/defaults/loader.conf

    After this message appears, you see the following prompt:

    Hit [Enter] to boot immediately, or space bar for command prompt.

    Press the space bar to access the loader prompt (loader>).
    The loader> prompt appears. Enter:

    loader> install file:///<image-path-on-usb>

    An example of a command is as follows:

    loader> install file:///junos-srxsme-10.0R2-domestic.tgz



  • 3.  RE: How do you boot from usb from => mode?

    Posted 05-21-2019 23:19

    Hi, Matt


    I am assuming you already try the "reset" or "boot" commands and you reached the same prompt; if not please try them.

    If the SRX is getting stuck on uboot (not even reaching Loader) you could try the steps mentioned in the following KB in order to upgrade/reinstall the Loader and maybe after that you could try to recover the device with a USB drive from the Loader:



    A different person tried this already and it worked:



    Also you can try, from u-boot, to boot from the secondary partition of your SRX:



    Ive also see the "setenv bootloader usb1:0" command in a couple of forums, however Im not sure about how to use it, maybe you can research more about it; it seems to work with a usb stick:



    Also you could try creating a snapshot from a working SRX in to a USB and inserted in the faulty SRX and have it booting from this usb:



    I hope the above info helps you, please let us know.





  • 4.  RE: How do you boot from usb from => mode?

    Posted 05-22-2019 14:54

    I am getting this error "## No elf image at address 0x00100000"


    I am currently in the => mode. The following commands I have access too:

    askenv - get environment variables from stdin
    autoscr - run script from memory
    base - print or set address offset
    bdinfo - print Board Info structure
    boot - boot default, i.e., run 'bootcmd'
    bootd - boot default, i.e., run 'bootcmd'
    bootelf - Boot from an ELF image in memory
    bootloader - upgrade u-boot
    bootloader - upgrade loader
    bootloader - upgrade ushell
    bootloader - check u-boot
    bootloader - check loader
    bootm - boot application image from memory
    bootoct - Boot from an Octeon Executive ELF image in memory
    bootoctelf - Boot a generic ELF image in memory. NOTE: This command does not support
    simple executive applications, use bootoct for those.
    bootoctlinux - Boot from a linux ELF image in memory
    bootp - boot image via network using BootP/TFTP protocol
    bootvx - Boot vxWorks from an ELF image
    cmp - memory compare
    coninfo - print console devices and information
    cp - memory copy
    cpld - peek/poke CPLD
    crc32 - checksum calculation
    dhcp - invoke DHCP client to obtain IP/boot params
    dumpoct - dump octeon regs
    dumpstats - dump cavium stats
    echo - echo args to console
    eeprom - EEPROM sub-system
    erase - erase FLASH memory
    fatinfo - print information about filesystem
    fatload - load binary file from a dos filesystem
    fatls - list files in a directory (default /)
    flinfo - print FLASH memory information
    go - start application at address 'addr'
    gpio - read/write on gpio pins
    help - print online help
    i2c - read/write on i2c bus
    id_eeprom - peek/poke EEPROM
    ide - IDE sub-system
    iminfo - print header information for application image
    imls - list all images found in flash
    itest - return true/false on integer compare
    loadb - load binary file over serial line (kermit mode)
    loads - load S-Record file over serial line
    loady - load binary file over serial line (ymodem mode)
    loop - infinite loop on address range
    ls609x_read_reg - Read 88E6097 register
    md - memory display
    mdkinit - start MDK
    mm - memory modify (auto-incrementing)
    mtest - simple RAM test
    mw - memory write (fill)
    nfs - boot image via network using NFS protocol
    nm - memory modify (constant address)
    pci - list and access PCI Configuration Space
    pciemd - pcie memory display
    pciemw - pcie memory write
    pciereset - do PCIE reset
    ping - send ICMP ECHO_REQUEST to network host
    printenv- print environment variables
    protect - enable or disable FLASH write protection
    rarpboot- boot image via network using RARP/TFTP protocol
    read64 - read 64 bit word from 64 bit address
    read64b - read 8 bit word from 64 bit address
    read64l - read 32 bit word from 64 bit address
    read_cmp - read and compare memory to val
    reset - Perform RESET of the CPU
    run - run commands in an environment variable
    saveenv - save environment variables to persistent storage
    setenv - set environment variables
    sleep - delay execution for some time
    smi - peek/poke SMI devices
    tftpboot- boot image via network using TFTP protocol
    usb - USB sub-system
    usbboot - boot from USB device
    version - print monitor version
    watchdog <start | stop | show | pat>
    write64 - write 64 bit word to 64 bit address
    write64b - write 8 bit word to 64 bit address
    write64l - write 32 bit word to 64 bit address

  • 5.  RE: How do you boot from usb from => mode?

    Posted 05-22-2019 16:08



    Please reinstall/upgrade the loader and uboot as shown in the first two links from my previous comment and let us know.


  • 6.  RE: How do you boot from usb from => mode?

    Posted 01-09-2020 13:11

    I ran into this issue today.


    I ran "bootd" and it started fine.  After 5 sec, press "space" to get to => to "loader>" mode. 

    Once in loader mode, i ran 'Boot -s" command


    You will end up at following prompt:

    Enter full pathname of shell or 'recovery' for root password recovery or RETURN for /bin/sh: recovery

    Y(ou have 10 sec to enter 'recovery', else restart process.


    then I ended up at root>.  You can optionally reset root password or install new image or whatever you wanted..