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# Upgrading from Release 5.1.1 or Lower-Numbered Releases to Release 6.x.x or Higher-Numbered Releases

Release 5.1.1 or lower-numbered releases support application images only up to 172 MB. To install larger application images for Release 6.0.0 and higher-numbered releases, you must first install Release 5.1.2 (or a higher-numbered 5.x.x release). This enables the system to support application images greater than 172 MB. For example, you cannot go from Release 5.1.1 to Release 7.2.0 without first upgrading to Release 5.1.2. See the following table for compatibility of releases.

JUNOSe Release | Highest Release Able to Load | Cannot Load | Maximum Application Image
--- | --- | --- | ---
5.1.1 or lower-numbered release | 5.3.5p0-2 or the highest-numbered 5.x.x release | 6.x.x or higher-numbered release | ~172 MB
5.1.2 or higher-numbered release | No limitation | Not applicable | ~234 MB
7.2.0 or higher-numbered release | No limitation | Not applicable | ~256 MB

Your software upgrades may be available remotely through Telnet or FTP, or may be delivered on a new NVS card. Depending on how you access the software updates, there are two different procedures to follow. For more detailed information on installing software, and about NVS cards and SRP modules, see:

- JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules
- Upgrading NVS Cards on SRP Modules

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