Separate OS update and ATX into a dedicated section (#1506)

docs/v4.md

@@ -143,7 +143,11 @@ You will see the initial dashboard screen of the PiKVM where you can access the
 
 ### Change the default passwords
 
-For security's sake, it's best to change the default passwords immediately after running PiKVM for the first time. To do that:
+For security's sake, it's best to change the default passwords immediately after running PiKVM for the first time. 
+
+!!! danger "Please ensure that you change both passwords: for web UI access and for the superuser (root)"
+
+To do that:
 
 1. On the initial dashboard screen, click the **Terminal** button to open the web terminal. You will see this command line interface:
 
@@ -201,15 +205,19 @@ For security's sake, it's best to change the default passwords immediately after
 
     ![Work remotely](remote-screen.png){ width="450" }
 
-## Further steps
+## Important next steps
+
+- We strongly recommend to update the PiKVM OS after the first launch:
+
+    {!_update_os.md!}
+
+- Set up [ATX connection](atx_board.md) if you need to control the power of the remote system.
+
+## Further recommendations
 
 1. **Get to know PiKVM OS**: read [this help section](webui.md) to better understand all the possibilities of the web user interface.
 
-2. **Update and customize the system**:
-
-    - We strongly recommend to update the PiKVM OS after the first launch:
-
-        {!_update_os.md!}
+2. **Customize the system**:
 
     - [Harden the remote access](auth.md) by enabling 2FA.
     - Configure access to PiKVM from the Internet using [port forwarding](port_forwarding.md) or [Tailscale VPN](tailscale.md).
@@ -219,7 +227,6 @@ For security's sake, it's best to change the default passwords immediately after
 
 3. **Configure hardware**:
 
-    - Set up [ATX connection](atx_board.md).
     - Install and set up [Wi-Fi antenna](wifi.md).
     - Install and set up [LTE/5G modem](modem.md) (**only for PiKVM V4 Plus**).