update readme.md

README.md

@@ -4,12 +4,16 @@ English | [简体中文](#简体中文)
 
 This project makes ASR650x (ASR6501, ASR6502) series fully Arduino-Compatible. For [Heltec](https://heltec.org/) [CubeCell](https://heltec.org/proudct_center/lora/cubecell/) series.
 
-Based on the ASR650x series of chips, we have done a lot of migration and development, made it perfectly support **Arduino®**, can run the LoRaWAN protocol stably, and can easily connect lithium batteries and solar panels… This is the CubeCell series.
+Based on the ASR650x series of chips, we have done a lot of migration and development, made it perfectly support **Arduino<sup>®</sup>**, can run the LoRaWAN-Node protocol stably, and can easily connect lithium batteries and solar panels… This is the CubeCell series.
 
 Cube — Means modular design and easy assembly;
 
 Cell — Is the product positioning, as a unit of the IoT series, working like a cell.
 
+CubeCell series LoRaWAN-Node stack is migration form [LoRaMac-node](https://github.com/Lora-net/LoRaMac-node) V4.4.0, based on "LoRaWAN specification 1.0.2" and "LoRaWAN Regional Parameters v1.0.2rB".
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+&nbsp;
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 For more details, please refer to **[CubeCell Documents Page](https://heltec-automation-docs.readthedocs.io/en/latest/cubecell/index.html).**
 
 &nbsp;
@@ -21,20 +25,21 @@ The currently supported ASR650x chip product models are:
 | MCU | Relative boards |
 | :-----: | :----------------------------------------------------------: |
 | ASR6501 | [CubeCell-Board](https://heltec.org/project/htcc-ab01/), [CubeCell-Module](https://heltec.org/project/htcc-am01/), [CubeCell-Cupsule](https://heltec.org/project/htcc-ac01/) |
+| ASR6502 | Coming soon |
 
 &nbsp;
 
 ## Installation Instructions
 
 Make sure you have the latest Arduino IDE installed on your computer. If not installed, please refer to this documents:
 
-- [How to Install Git and Arduino](https://docs.heltec.cn/#/en/user_manual/how_to_install_git_and_arduino)
-- [Establish Serial Connection](https://docs.heltec.cn/#/en/user_manual/establish_serial_connection)
+- [How to Install Git and Arduino](https://heltec-automation-docs.readthedocs.io/en/latest/general/how_to_install_git_and_arduino.html)
+- [Establish Serial Connection](https://heltec-automation-docs.readthedocs.io/en/latest/general/establish_serial_connection.html)
 
 &nbsp;
 
 - **Via Arduino IDE Boards Manager (Recommend)**
- - [Install ASR650x-Arduino(CubeCell) via Arduino Boards Manager](https://docs.heltec.cn/#/en/user_manual/how_to_install_ASR650x_Arduino)
+ - [Install ASR650x-Arduino(CubeCell) via Arduino Boards Manager](https://heltec-automation-docs.readthedocs.io/en/latest/cubecell/quick_start.html)
 
 - **Use Git with the development repository**
  + [Instructions for Windows](InstallGuide/windows.md)
@@ -75,6 +80,7 @@ Also you can talk in our forum: [http:https://community.heltec.cn/](http:https://community.h
 | MCU | Relative boards |
 | :-----: | :----------------------------------------------------------: |
 | ASR6501 | [CubeCell-Board](https://heltec.org/project/htcc-ab01/), [CubeCell-Module](https://heltec.org/project/htcc-am01/), [CubeCell-Cupsule](https://heltec.org/project/htcc-ac01/) |
+| ASR6502 | Coming soon |