How can I configure the Set Boot File menu on an AR

The method is as follows:
1. Restart an AR, and press Ctrl+B within 3 seconds to enter the BootROM menu when the system displays "Press Ctrl+B to break auto startup ... 3".
2. Select 4. Startup Select to enter the startup submenu.
3. Select 2. Set Boot File to enter the Set Boot File menu. Set the system software package for the next startup.
Before a system upgrade or downgrade, you need to use this submenu to specify the system software.

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