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### Instruction:
How do you upgrade from one major IOS XR release to another using the 'mini' PIE?
### Response:
To upgrade from one major IOS XR release to another using the 'mini' PIE\n1. Copy the new 'mini' PIE and any required optional PIEs to the router's disk\n2. Use the `install add` command to unpack the 'mini' PIE and optional PIEs\n3. Use the `install activate` command to activate the new software\n4. Commit the new software set using `install commit`\n5. Reload the router for the new version to take effect\n\nNote: All installed optional PIEs must match the version of the new 'mini' PIE.\"\n
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