diff --git a/docs/en/base/btc_base.md b/docs/en/base/btc_base.md
index ca030141..8d4518f6 100644
--- a/docs/en/base/btc_base.md
+++ b/docs/en/base/btc_base.md
@@ -6,17 +6,17 @@
 
 ##  Description
 
-**BTC** is a M5 base that allows you sit your M5 core instead of laying them down or hang on the wall. BTC is not just a sit for holding the M5 core but also comes with serveral features like temperature and humiluty detection(by DHT12), and charging base.
+**BTC** is a M5 base that allows you sit your M5 core instead of laying them down or hang on the wall. BTC is not just a sit for holding the M5 core but also comes with serveral features like temperature and humiluty detection(by SHT30), and charging base.
 
 **Note:**
 
 * Although M5Core [BASIC](https://docs.m5stack.com/#/en/core/basic) or [GRAY](https://docs.m5stack.com/#/en/core/gray) can be attached to this base, but BTC can not charge them. Actually, our Cores, as we know, are built in chargin chip (IP5306). After plugged a USB cable in, the Core was charging without any charger.
 
-* Once M5Core has been attached to BTC, it can not controll ENV Unit at this time. Because BTC has been built in DHT12 sensor which will cause IIC address conflict.
+* Once M5Core has been attached to BTC, it can not controll ENV Unit at this time. Because BTC has been built in SHT30 sensor which will cause IIC address conflict.
 
 ### Product Features
 
--  DHT12 inside
+-  SHT30 inside
 
 #  Include
 
@@ -29,11 +29,11 @@
 
 #  PinMap
 
-**DHT12**
+**SHT30**
 
 <table>
  <tr><td>ESP32 Chip</td><td>GPIO22</td><td>GND</td><td>GPIO21</td><td>3V3</td></tr>
- <tr><td>DHT12</td><td>SCL</td><td>GND</td><td>SDA</td><td>3V3</td></tr>
+ <tr><td>SHT30</td><td>SCL</td><td>GND</td><td>SDA</td><td>3V3</td></tr>
 </table>
 
 <img src="assets/img/product_pics/module/module_btc_dht12_pinmap.webp">
@@ -43,11 +43,38 @@
 
 - [DHT12 datasheet](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/hat/DHT12_en.pdf)
 
+- [SHT30 datasheet](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/unit/SHT3x_Datasheet_digital.pdf)
+
 ## Example
 
 ### Arduino IDE
 
-- To get the code `BTC.ino`, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino)
+- To get the code `BTC.ino`, please click [here](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino/BTC2.1)
+
+## Version Change
+
+<table>
+   <thead>
+      <tr> 
+         <th>Release Date</th>
+         <th>Product Change</th>
+         <th>Note:</th>
+      </tr>
+   </thead>    
+   <tbody>
+      <tr>
+         <td>2017.7</td>
+         <td>Initial public release</td>
+         <td>/</td>
+      </tr>
+      <tr>
+         <td>2020.5</td>
+         <td>DHT12 changed to SHT30</td>
+         <td>/</td>
+      </tr>
+   <tbody>
+</table>
+
 
 <script>
 
diff --git a/docs/en/core/basic.md b/docs/en/core/basic.md
index 37320233..68398704 100644
--- a/docs/en/core/basic.md
+++ b/docs/en/core/basic.md
@@ -330,9 +330,11 @@ For more information about Pin assignment and Pin Remapping, Please refer to [ES
 
 <table>
       <thead>
-         <th>Release Date</th>
-         <th>Product Change</th>
-         <th>Note:</th>
+         <tr>
+            <th>Release Date</th>
+            <th>Product Change</th>
+            <th>Note:</th>
+         </tr>
       </thead>
       <tbody>   
          <tr>
diff --git a/docs/en/core/m5stickt.md b/docs/en/core/m5stickt.md
index d0248fdf..59647aa3 100644
--- a/docs/en/core/m5stickt.md
+++ b/docs/en/core/m5stickt.md
@@ -240,7 +240,7 @@ Resolution：135 * 240
 
 ### Arduino IDE
 
-- If you want the complete code, please click [here](https://github.com/m5stack/M5-StickT/tree/master/M5_StickC_Lepton_opensource_v1)
+- If you want the complete code, please click [here](https://github.com/m5stack/M5-StickT)
 
 <script>
 
diff --git a/docs/en/unit/accel.md b/docs/en/unit/accel.md
index 48d015a5..0f11aa7d 100644
--- a/docs/en/unit/accel.md
+++ b/docs/en/unit/accel.md
@@ -46,6 +46,7 @@ By measuring the amount of static acceleration due to gravity, you can find out
 - Datasheet - **[ADXL345](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/unit/ADXL345_en.pdf)** 
   
 ## Schematic
+
 <img src="assets/img/product_pics/unit/accel/accel_04.webp">
 
 ### PinMap
diff --git a/docs/en/unit/tof.md b/docs/en/unit/tof.md
index 3a8b9288..c39993b6 100644
--- a/docs/en/unit/tof.md
+++ b/docs/en/unit/tof.md
@@ -75,7 +75,7 @@ This unit comunicates with M5Core via I2C(0x29).
 
 ## Schematic
 
-[ToF Schematic](https://github.com/m5stack/M5-Schematic/blob/master/Units/UNIT_TOF.pdf)
+[ToF Schematic](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Units/UNIT_TOF.pdf)
 
 <img src="assets/img/product_pics/unit/tof/unit_tof_sch_01.webp">
 
diff --git a/docs/zh_CN/base/btc_base.md b/docs/zh_CN/base/btc_base.md
index 3374cbf7..3ed473d9 100644
--- a/docs/zh_CN/base/btc_base.md
+++ b/docs/zh_CN/base/btc_base.md
@@ -6,17 +6,17 @@
 
 ## 描述
 
-**BTC** 是一款集成了"DHT12"的温湿度传感器底座，除了用作固定M5Core之外，运用其内置的温湿度传感器能够制作环境监测器或是一些与环境数据采集相关的应用.
+**BTC** 是一款集成了"SHT30"的温湿度传感器底座，除了用作固定M5Core之外，运用其内置的温湿度传感器能够制作环境监测器或是一些与环境数据采集相关的应用.
 
 **注意:**
 
 * 兼容BTC底座的有 [BASIC](https://docs.m5stack.com/#/zh_CN/core/basic) 与 [GRAY](https://docs.m5stack.com/#/zh_CN/core/gray) 两款主控，当将USB线连接BTC底座，仅对M5Core的电路板进行供电，并不会为其内部的锂电池充电.只有将USB线连接至M5Core时，才会对M5Core电池充电且同时为电路板供电.
 
-* 当M5Core连接至BTC底座后，将无法同时控制 ENV Unit.这是因为在 BTC 已经内置了DHT12传感器，两者将产生 I2C 地址冲突.
+* 当M5Core连接至BTC底座后，将无法同时控制 ENV Unit.这是因为在 BTC 已经内置了SHT30传感器，两者将产生 I2C 地址冲突.
 
 ##  产品特性
 
--  内置DHT12
+-  内置SHT30
 
 ##  包含
 
@@ -29,24 +29,52 @@
 
 ##  管脚映射
 
-**DHT12**
+**SHT30**
 
 <table>
  <tr><td>ESP32 Chip</td><td>GPIO22</td><td>GND</td><td>GPIO21</td><td>3V3</td></tr>
- <tr><td>DHT12</td><td>SCL</td><td>GND</td><td>SDA</td><td>3V3</td></tr>
+ <tr><td>SHT30</td><td>SCL</td><td>GND</td><td>SDA</td><td>3V3</td></tr>
 </table>
 
 <img src="assets/img/product_pics/module/module_btc_dht12_pinmap.webp">
 
 ## 相关链接
 
-- **[DHT12 数据手册](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/hat/DHT12_en.pdf)**
+- [DHT12 datashee](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/hat/DHT12_en.pdf)
+
+- [SHT30 datasheet](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/unit/SHT3x_Datasheet_digital.pdf)
 
 ## 案例程序
 
 ### Arduino IDE
 
-[请点击此处](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino)获取完整代码
+[请点击此处](https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Base/BTC/Arduino/BTC2.1)获取完整代码
+
+
+## 版本变更
+
+<table>
+   <thead>
+      <tr> 
+         <th>上市日期</th>
+         <th>产品变动</th>
+         <th>备注：</th>
+      </tr>
+   </thead>    
+   <tbody>
+      <tr>
+         <td>2017.7</td>
+         <td>首次发售</td>
+         <td>/</td>
+      </tr>
+      <tr>
+         <td>2020.5</td>
+         <td>DHT12修改为SHT30</td>
+         <td>/</td>
+      </tr>
+   <tbody>
+</table>
+
 
 <script>
 
diff --git a/docs/zh_CN/core/m5stickt.md b/docs/zh_CN/core/m5stickt.md
index badb0a97..6559a5b1 100644
--- a/docs/zh_CN/core/m5stickt.md
+++ b/docs/zh_CN/core/m5stickt.md
@@ -235,7 +235,7 @@ M5StickT仅支持WIN10&Linux&MAC(10.15以下）免驱，其余操作系统则需
 
 ### ArduinoIDE
 
-- 点击[这里](https://github.com/m5stack/M5-StickT/tree/master/M5_StickC_Lepton_opensource_v1)获取Arduino示例
+- 点击[这里](https://github.com/m5stack/M5-StickT)获取Arduino示例
 
 
 
diff --git a/docs/zh_CN/unit/accel.md b/docs/zh_CN/unit/accel.md
index 6c9b8e88..cae8303a 100644
--- a/docs/zh_CN/unit/accel.md
+++ b/docs/zh_CN/unit/accel.md
@@ -91,8 +91,6 @@
 
 <img src="assets/img/product_pics/unit/accel/accel_04.webp">
 
-- **[原理图](https://github.com/m5stack/M5-Schematic/blob/master/Units/UNIT-ACC.pdf)**
-
 ## 案例程序
 
 ### Arduino
diff --git a/docs/zh_CN/unit/tof.md b/docs/zh_CN/unit/tof.md
index ffac95e0..e9337f26 100644
--- a/docs/zh_CN/unit/tof.md
+++ b/docs/zh_CN/unit/tof.md
@@ -87,7 +87,7 @@
 
 ## 原理图
 
-[ToF Schematic](https://github.com/m5stack/M5-Schematic/blob/master/Units/UNIT_TOF.pdf)
+[ToF Schematic](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Units/UNIT_TOF.pdf)
 
 <img src="assets/img/product_pics/unit/tof/unit_tof_sch_01.webp">