Recovering From U-boot Mode

Have you ever found your Junos device stuck in the "U-boot" mode ( => ) before? Mario Costa explains how to recover from this situation.


When in this state your Junos image has of course "magically disappeared" and your heart skips an unhealthy beat. Here is a survival guide that will aid you in getting Junos installed from a TFTP/FTP server on your network.


Step 1:

Firstly, you need to get your environment variables set, which is basically assigning the following: Management Port IP address (ipaddr), Gateway IP address (gatewayip), TFTP/FTP Server IP address (serverip)

setenv ipaddr

setenv netmask

setenv gatewayip

setenv serverip



Step 2:

Secondly, reboot the device (boot command) to then access the "Loader" prompt. During the reboot process you will be presented with the following output:

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


After pressing the space bar key on your keyboard you gain access to the Loader prompt:



Step 3:

Thirdly, you need to install (via TFTPBOOT) the JunOS image on your device:

loader>install tftp://


Step 4:

Wait patiently as the Junos device boots. After the boot process has completed successfully you should have Junos installed on your internal flash and a "healthy device" up and running again.

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The U-boot mode is prior to

The U-boot mode is prior to the loader prompt so if you are stuck there then you cannot access the loader...

العاب سيارات
yes, why does Junos device

yes, why does Junos device stuck in U-boot? never understood the logic. myassignmenthelpaustralia blogspot com anyways thanks for sharing the solution hope it will be helpful.

Read more here:

Read more here:

u-mode binary

thnaks, it helps me with th U-mode. John S. Ontario, Canada.

In this weekly series,

In this weekly series, Proteus rock stars provide questions designed to help you obtain a Junos-based certification.


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