Install Junos with USB

You discover that your Junos EX or SRX device does not complete normal boot up. The image seems to be corrupted for some reason, such as a continuous power failure. If this occurs, don’t worry, you can get it back up within few minutes using the USB port.

Step 1. Get a USB flash drive. Copy the Junos image to the USB drive (without creating folders). Use FAT file format if the USB size is less than 2 GB. Use FAT32 if the USB size is greater than or equal to 4 GB. The example below uses the file image junos-srxsme-10.4R1.9-domestic.tgz.

Step 2. Insert the flash into an EX/SRX USB port.

Step 3. Reboot the device. When Junos boots up, you will see the
message :

Press Space to abort autoboot
Do nothing. A little while later, you will see:
Hit [Enter] to boot immediately, or space bar for command
prompt.
Press the space bar. You will be at loader mode; the prompt should
be loader>. If the prompt is > , type >boot to make it loader>.

Step 4. Now type the following command:

loader> install file:///junos-srxsme-10.4R1.9-domestic.tgz.

Expect to wait awhile for the code to download. Additionally, after
the Junos OS boots, you may see messages relating to file system
 

To upgrade your JUNOS: 

root>request system software add /tmp/usb/junos-jsr-10.0R3.10-export.tgz no-validate no-copy 

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