diff --git a/deapi/Guide to use mamba.pdf b/deapi/Guide to use mamba.pdf
new file mode 100644
index 0000000..d70dccc
Binary files /dev/null and b/deapi/Guide to use mamba.pdf differ
diff --git a/deapi/python_3_instruction.txt b/deapi/python_3_instruction.txt
index 72a86d4..a5148e4 100644
--- a/deapi/python_3_instruction.txt
+++ b/deapi/python_3_instruction.txt
@@ -1,31 +1,8 @@
-1. Install Python 3
+1. Install miniforge and setup python environment 
 ===================
-Download the latest version on https://repo.anaconda.com/archive/Anaconda3
-Check Install for All users
-Check Add Path 
+Follow the instructions in the document "Guide to use mamba" 
 
-2. Packages requried by Direct Electron
-===================================
-python -m pip install --upgrade pip
-python -m pip install protobuf
-python -m pip install mrcfile
-
-3. The Path Environment variable
-==============================
-If you encourter ssl module problem while installing packages, add the following to the path variable
-C:\...\Anaconda3
-C:\...\Anaconda3\Scripts
-C:\...\Anaconda3\Library\bin
-
-
-4. Migrate Python 2 code to Python 3
-==================================
-If you have Python 2 code, you can migrate to Python 3 using this tool. 
-python -m pip install 2to3
-Example: 2to3.exe -w some_p2_code.py
-
-
-5. Documentation
+2. Test API 
 ================
 Run 90_example2.py with the simulator version server to verify the API is work.
-The result should be "OnTestMovieBuffer : Check value passed!"  
+The result should be "OnTestMovieBuffer : Check value passed!"   
diff --git a/deapi/release_notes.txt b/deapi/release_notes.txt
index 514c72e..52a6678 100644
--- a/deapi/release_notes.txt
+++ b/deapi/release_notes.txt
@@ -1,3 +1,38 @@
+Changes in 5.2.3:
+=================
+#3179 C++ SDK GetResult function has deadlock issue if DE-MC version is 2.5 
+
+Changes in 5.2.2:
+=================
+#3010 Fixed Python API compatible issue for GetResult
+#2966 Fixed a crashing issue for SetROI function 
+#2917 Added Python function PropertyValidValues back(Deprecated, please use GetPropertySpecifications)
+
+Changes in 5.2.1:
+=================
+#2981 Made GetResult compatible with server 2.5.
+#2978 Fixed issue with setting ROI using Python 5.2 API and 2.7.2
+#2977 Fixed issue connecting using 5.2 API with older server versions
+#2966 fixed issues with SetROI function
+
+Changes in 5.2.0:
+=================
+#2459 Add statistic for "Incident e-/pix/s" - Refactored style of image attributes incident statistics for Python SDK
+#2924 Add property "Ignore Stretch Type From Client" force to ignore contrast stretch for SDK versions below released 5.2
+#2917 Update property read-only status on GUI when server changes a property's read-only status 
+#2901 Add function SetAdaptiveROI(int offsetX, int offsetY, int sizeX, int sizeY) to API
+#2319 Display the fraction of saturated pixels in the acquisition - Added saturation warning image attributes for SDK.
+#2805 Add an API function for the scan controller that allows users to pass an array of X, Y coordinates
+#2833 Test RTX 5000 Ada for CeleritasXS - Fixed printing issue in python api
+#2794 Allow start/stop saving during acquisition through SDK
+#2747 Exception occurs when setScanROI() by Python API
+#1560 Support read-only client connection
+#2671 Make the ID correspond to the virtual mask index
+#2669 SDK cannot get virtual mask until the SDK take an acquisition first
+#2658 Modify the 90_example to make it support for both 2.7.2 and 2.7.3
+#2651 Add SetScanSize, SetScanROI, SetScanSizeAndGetChangedProperties, SetScanROIAndGetChangedProperties in all SDK
+#2386 Use API function to set Engineering Mode instead of using property
+
 Changes in 5.1.0:
 =================
 #2522 Fixed GetResult for scanning in SDK uses image size instead of scan size