diff --git a/docs/doc/assets/si7021.png b/docs/doc/assets/si7021.png
new file mode 100644
index 00000000..a756fe27
Binary files /dev/null and b/docs/doc/assets/si7021.png differ
diff --git a/docs/doc/en/modules/temp_humi.md b/docs/doc/en/modules/temp_humi.md
index eb796efb..16137f07 100644
--- a/docs/doc/en/modules/temp_humi.md
+++ b/docs/doc/en/modules/temp_humi.md
@@ -4,10 +4,17 @@ title: Reading Temperature and Humidity Sensors with MaixCAM MaixPy
 
 ## Introduction
 
-By attaching a temperature and humidity sensor module to MaixCAM, you can easily read the environmental temperature and humidity. This example uses the `Si7021` sensor, which can be driven via `I2C`.
+By attaching a temperature and humidity sensor module to the MaixCAM, you can easily measure the environmental temperature and humidity. Here, we use the `Si7021` sensor as an example, which can be driven using `I2C`. For other sensors, you can request drivers from the manufacturer and use `I2C` or `SPI` to read data from them.
 
-The complete code is available at [MaixPy/examples/sensors/temp_humi_si7021.py](https://github.com/sipeed/MaixPy/blob/main/examples/sensors/temp_humi_si7021.py).
+![](../../assets/si7021.png)
 
-Note that the system image needs to be version `>= 2024.6.3_maixpy_v4.2.1`.
+**Note**: The power supply should be 3.3V. Connecting it to 5V may cause damage.
 
+Connect the `SCL` / `SDA` pins of the sensor to the corresponding `SCL` / `SDA` pins on the MaixCAM. For instance, on `I2C5`, this corresponds to `A15(SCL)` / `A27(SDA)`.
+
+## Usage
+
+The complete code can be found in the [MaixPy/examples/ext_dev/sensors](https://github.com/sipeed/MaixPy/blob/main/examples/ext_dev/sensors) directory. Look for the `si7021` example.
+
+**Note**: The system image version must be `>= 2024.6.3_maixpy_v4.2.1`.
 
diff --git a/docs/doc/zh/modules/temp_humi.md b/docs/doc/zh/modules/temp_humi.md
index 88a5b34f..5886244d 100644
--- a/docs/doc/zh/modules/temp_humi.md
+++ b/docs/doc/zh/modules/temp_humi.md
@@ -4,11 +4,17 @@ title: MaixCAM MaixPy 读取温湿度传感器
 
 ## 简介
 
-通过给 MaixCAM 外挂一个温湿度传感器模块，可以轻松读取到环境温度和湿度，这里以 `Si7021` 这款传感器为例，通过 `I2C` 可以驱动它。
+通过给 MaixCAM 外挂一个温湿度传感器模块，可以轻松读取到环境温度和湿度，这里以 `Si7021` 这款传感器为例，通过 `I2C` 可以驱动它，其它的传感器你也可以找厂商要驱动然后使用 I2C / SPI 读取。
+
+![](../../assets/si7021.png)
+
+注意供电是 3.3v，不要接错到 5v 导致烧毁。
+
+`SCL` / `SDA` 接到 MaixCAM 的 `SCL` / `SDA` 即可，比如 `I2C5` 对应的`A15(SCL)/ A27(SDA)`。
 
 ## 使用
 
-完整的代码在[MaixPy/examples/ext_dev/sensors/temp_humi_si7021.py](https://github.com/sipeed/MaixPy/blob/main/examples/sensors/temp_humi_si7021.py)
+完整的代码在 [MaixPy/examples/ext_dev/sensors](https://github.com/sipeed/MaixPy/blob/main/examples/ext_dev/sensors) 目录下， 找到`si7021` 的例程即可。
 
 注意系统镜像需要 `>= 2024.6.3_maixpy_v4.2.1` 版本。
 
diff --git a/examples/tools/install_runtime.py b/examples/tools/install_runtime.py
index 60133c24..7ee7b420 100644
--- a/examples/tools/install_runtime.py
+++ b/examples/tools/install_runtime.py
@@ -1,6 +1,9 @@
 import os
 
-def install_runtime():
+def install_runtime(force = False):
+    version_path = "/maixapp/maixcam_lib.version"
+    if force and os.path.exists(version_path):
+        os.remove(version_path)
     cmd = f"chmod +x /maixapp/apps/settings/settings && /maixapp/apps/settings/settings install_runtime"
     err_code = os.system(cmd)
     if err_code != 0:
@@ -8,4 +11,6 @@ def install_runtime():
     else:
         print(f"Install runtime success")
 
-install_runtime()
+
+force_reinstall = False   # reinstall runtime even we alredy installed.
+install_runtime(force_reinstall)