Change Boot Parameters by Interrupting a Boot in Progress

To access and change boot parameters by interrupting a boot in progress:

When the system is in the process of booting, you can press the space bar on your keyboard to interrupt when you see the following message appear:
```
Press the space bar to stop auto-boot...
```
After you stop the booting process, you can enter the letter p to display the current parameters, the letter c to change the boot parameters or the @ (at-sign) to continue booting.
```
[Boot]: c
'.' = clear field;  '-' = go to previous field;  q = quit
Boot File	: /boot/nnScz100.bz
```
To navigate through the boot parameters, press Enter and the next parameter appears on the following line.

You can navigate through the entire list this way. To go back to a previous line, type a hyphen (-) and press Enter. Any value that you enter entirely overwrites the existing value and does not append to it.
To change a boot parameter, type the new value that you want to use next to the old value. For example, if you want to change the image you are using, type the new filename next to the old one.
```
'.' = clear field;  '-' = go to previous field;  q = quit

Boot File	: /boot/nnSCz100.bz /boot/nnSCz200.bz
```
After you have scrolled through the complete list of boot parameters, you return to the boot prompt. To reboot with your changes taking effect, type @ (the at-sign), and press Enter.
```
[Acme Packet Boot]: @
```
The system completes the full booting sequence, unless there is an error in the boot parameters.

If you have configured boot parameters correctly, the system prompt displays and you can go ahead with configuration, management, or monitoring tasks.

Note:
If you have configured the boot parameters incorrectly, the system goes into a booting loop and displays an error message. Press the space bar to stop the loop. Correct the error, and reboot your system.