diff --git a/README.md b/README.md
index 5ebf7e5..9d7b961 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,11 @@ Note: udhcpd is a DHCP server for Ubuntu and Debian.
 Note: Two in-house players are written for Raspberry Pi 3. You may use omxplayer or vlc on other platforms.
 
 # Preparation
-**The wpa_supplicant installed in the latest Raspbian distribution does not seem to work properly. (See [this](https://www.reddit.com/r/linux4noobs/comments/c5qila/want_to_downgrade_wpa_supplicant/).) For Raspbian Buster, try downgrading the ``wpasupplicant`` package to the version for Raspbian Stretch.**  
+**The wpa_supplicant installed in the latest Raspbian distribution does not seem to work properly. (See [this](https://www.reddit.com/r/linux4noobs/comments/c5qila/want_to_downgrade_wpa_supplicant/).) For Raspbian Buster, try downgrading the ``wpasupplicant`` package to the version for Raspbian Stretch. Here is one solution:**
+```
+wget http://ftp.us.debian.org/debian/pool/main/w/wpa/wpasupplicant_2.4-1+deb9u4_armhf.deb
+sudo apt --allow-downgrades install ./wpasupplicant_2.4-1+deb9u4_armhf.deb
+```  
 Install missing packages:  
 ```
 sudo apt install udhcpd
diff --git a/udhcpd.conf b/udhcpd.conf
index e1d1a15..2d3fd2f 100644
--- a/udhcpd.conf
+++ b/udhcpd.conf
@@ -1,5 +1,5 @@
 start	192.168.173.80
 end	192.168.173.80
-interface	p2p-wlan0-3
+interface	p2p-wlan0-4
 option subnet 255.255.255.0
 option lease 60
\ No newline at end of file