# Installing JunosE Software

The JunosE Software resides on a nonvolatile storage (NVS) card located in the switch route processor (SRP) module. Each SRP module is shipped with an NVS card that contains a software release. New software releases are available for download from the Juniper Networks website at http://www.juniper.net/customers/support. You can use the downloaded image bundle to create your own software CDs.

| Caution: See the Release Notes for extra information about installing and upgrading the software.

This chapter provides information on how to install a new software release on a router and contains the following sections:

- Overview
- Platform Considerations
- Installing Software When a Firewall Exists
- Installing Software When a Firewall Does Not Exist
- Copying Release Files from One Router to Another
- Upgrading Systems That Are Operating with Two SRP Modules
- Upgrading JunosE Software
- Downgrading JunosE Software