Update 'README.md'

README.md

@@ -18,3 +18,17 @@
             }  
     - Connect the PI and wait 1 minute or 2 to boot   
     - Check the IP on DHCP Server
+
+# Update OS
+
+    sudo apt update && sudo apt upgrade
+
+# updade firmware
+
+    sudo apt update && sudo apt upgrade
+    sudo rpi-eeprom-update
+    sudo apt install rpi-eeprom
+
+# default username/password
+username : pi  
+password : raspberry