diff --git a/bsp/stm32/stm32l475-atk-pandora/README.md b/bsp/stm32/stm32l475-atk-pandora/README.md
index 2a90081c971102f283a48702786498b775bd491f..a4d46c0e3d73949e9d6a386e5f3e1aed975a2542 100644
--- a/bsp/stm32/stm32l475-atk-pandora/README.md
+++ b/bsp/stm32/stm32l475-atk-pandora/README.md
@@ -134,7 +134,7 @@ msh >
 
 ## 注意事项
 
-暂无
+关于ST-Link无法升级的问题请参考：https://github.com/armink/HackSTLinkUpgrade
 
 ## 联系人信息
 
diff --git a/bsp/stm32/stm32l475-atk-pandora/applications/arduino_pinout/README.md b/bsp/stm32/stm32l475-atk-pandora/applications/arduino_pinout/README.md
index 3c71e48dd13550f65c3fb8e4443265c620daabe5..03dbb1f7f6d54376bd693c9f592fe2c5e4e31465 100644
--- a/bsp/stm32/stm32l475-atk-pandora/applications/arduino_pinout/README.md
+++ b/bsp/stm32/stm32l475-atk-pandora/applications/arduino_pinout/README.md
@@ -154,5 +154,5 @@ Arduino的 analogWrite 函数虽为模拟写，但是实际输出的是PWM数字
 在潘多拉板上，使用PA4来当做真模拟输出功能引脚，使用方法为：
 
 ```c
-analogWrite(DAC0, 1024); // STM32的DAC分辨率为12位，因此第二个参数范围可以为0-4095
+analogWrite(DAC0, 128);
 ```