Adding sudo command in 399 update (#1019)

* Adding sudo command in 399 update

Adding sudo command in 399 update

* Remove sudo su and leave sudo

Author: martab1994

content/hardware/04.pro/boards/portenta-x8/tutorials/01.user-manual/content.md

@@ -299,9 +299,11 @@ chmod +x 399-install-update
 ```
 
 ```arduino
-./399-install-update
+sudo ./399-install-update
 ```
 
+Remember that the default password for admin access is `fio`.
+
 Now you need to reboot the board by pressing its pushbutton for around 10 seconds. After that, connect again to your Portenta X8 through the Command Line and type the following commands:
 
 ```arduino
@@ -313,7 +315,7 @@ chmod +x 399-finalize-update
 ```
 
 ```arduino
-./399-finalize-update
+sudo ./399-finalize-update
 ```
 
 These commands will make your V.399 compatible with [aklite-offline](https://docs.foundries.io/latest/user-guide/offline-update/offline-update.html) tool and will allow you to update your Portenta X8 to the latest image version Arduino released at that point in time. Arduino provides this tool for free for any Portenta X8 user to enable offline secure updates to all devices, even if those devices are not connected to any FoundriesFactory.