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Expand Up @@ -76,7 +76,7 @@ The bootloader may also be updated before the firmware is started if a `pieeprom

=== Fail-safe OS updates (TRYBOOT)

The bootloader/firmware provide a one-shot flag which, if set, is cleared but causes `tryboot.txt` to be loaded instead of `config.txt`. This alternate config would specify the pending OS update firmware, cmdline, kernel and os_prefix parameters. Since the flag is cleared before starting the firmware a crash or reset will cause the original `config.txt` file to be loaded on the next reboot.
The bootloader/firmware provide a one-shot flag which, if set, is cleared but causes `tryboot.txt` to be loaded instead of `config.txt`. This alternate config would specify the pending OS update firmware, cmdline, kernel and os_prefix parameters. Since the flag is cleared before starting the firmware, a crash or reset will cause the original `config.txt` file to be loaded on the next reboot.

To set the `tryboot` flag add `tryboot` after the partition number in the `reboot` command. Normally, the partition number defaults to zero but it must be specified if extra arguments are added.
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