diff --git a/11.0.x/11.3.1/README.md b/11.0.x/11.3.1/README.md
new file mode 100644
index 0000000..5f9b0c0
--- /dev/null
+++ b/11.0.x/11.3.1/README.md
@@ -0,0 +1,18 @@
+
+### Changelog
+ 1. macOS Big Sur 11.3.1 support added.
+ 2. OpenCore version updated to 0.6.9.
+ 3. Kexts updated.
+
+
+### What's Working/Not working
+ 1. Micro SD Card Reader - Not working in OpenCore.
+ 2. Need to check why `HEVC` encoding not working on `IdeaPad 320 15ISK`
+
+
+### Important
+Please add `SystemSerialNumber`, `SystemUUID` and `MLB`.
+
+
+### Download
+Please check release section to download.
diff --git a/11.0.x/11.3.1/screenshot.png b/11.0.x/11.3.1/screenshot.png
new file mode 100644
index 0000000..09e2654
Binary files /dev/null and b/11.0.x/11.3.1/screenshot.png differ
diff --git a/README.md b/README.md
index d4c4ef5..62933c2 100644
--- a/README.md
+++ b/README.md
@@ -21,9 +21,9 @@
 
 Goal of this repo is to run Mac os on Lenovo Ideapad 320 15ISK Laptop
 
-macOS Mojave 10.14.6            |  macOS Catalina 10.15.6 |  macOS Big Sur 11.2.3	
+macOS Mojave 10.14.6            |  macOS Catalina 10.15.6 |  macOS Big Sur 11.3.1	
 :-------------------------:|:-------------------------:|:-------------------------:
-![alt text](10.14.x/10.14.6/Screenshot.png)  |  ![alt text](10.15.x/10.15.6/screenshot.png)  |  ![alt text](11.0.x/11.2.3/screenshot.png)
+![alt text](10.14.x/10.14.6/Screenshot.png)  |  ![alt text](10.15.x/10.15.6/screenshot.png)  |  ![alt text](11.0.x/11.3.1/screenshot.png)
 
 ## macOS Catalina to Big Sur direct upgrade note:
  Download latest OpenCore zip folder from release and overwrite with existing one.
diff --git a/Tools/extract_efi_without_serial.sh b/Tools/extract_efi_without_serial.sh
index 839ac2f..4893f50 100755
--- a/Tools/extract_efi_without_serial.sh
+++ b/Tools/extract_efi_without_serial.sh
@@ -10,7 +10,7 @@ EFIOutputFolder=$(dirname $0)
 cd $EFIOutputFolder
 
 sudo diskutil mount $1
-cp -R /Volumes/ESP/EFI/OC $EFIOutputFolder
+cp -R /Volumes/EFI/EFI/OC $EFIOutputFolder
 cd $EFIOutputFolder
 plutil -replace PlatformInfo.DataHub.SystemSerialNumber -string "PLEASE INSERT YOUR OWN" OC/config.plist
 plutil -replace PlatformInfo.DataHub.SystemUUID -string "PLEASE INSERT YOUR OWN" OC/config.plist