diff --git a/README.md b/README.md
index e9e85c1..b55f651 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,6 @@ The NanoKVM Lite is constructed by the LicheeRV Nano and HDMItoCSI board, and th
 
 The NanoKVM image is built on LicheeRV Nano SDK and MaixCDK, and is compatible with materials that use the LicheeRV Nano, opposite the KVM software cannot be used with the LicheeRV Nano or other SG2002 products. If you would like to build an HDMI input application on LicheeRV Nano or MaixCam, please contact us for technical support.
 
-+ [HDMItoCSI Schematic](https://cn.dl.sipeed.com/fileList/KVM/nanoKVM/HDK/02_Schematic/SCH_RV_Nano_KVM_B_30131.pdf)
 + [NanoKVM-A Schematic](https://cn.dl.sipeed.com/fileList/KVM/nanoKVM/HDK/02_Schematic/SCH_RV_Nano_KVM_A_30111.pdf)
 + [NanoKVM-B Schematic](https://cn.dl.sipeed.com/fileList/KVM/nanoKVM/HDK/02_Schematic/SCH_HDMI_MIPI_31011.pdf)
 + [NanoKVM img](https://github.com/sipeed/NanoKVM/releases/tag/NanoKVM)
diff --git a/README_ZH.md b/README_ZH.md
index 78eff48..0f94a61 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -60,7 +60,6 @@ NanoKVM Lite 由 LicheeRV Nano E 和 HDMItoCSI 小板构成，NanoKVM FULL 在 N
 
 NanoKVM 镜像在LicheeRV Nano SDK 和 MaixCDK 基础上构建，可以兼容使用 LicheeRV Nano 的资料，反之LicheeRV Nano 或其他 SG2002 产品无法使用KVM软件。如果您想在 LicheeRV Nano 或 MaixCam 上构建 HDMI输入相关应用，请与我们联系，以获得技术支持。
 
-+ [HDMItoCSI 板原理图](https://cn.dl.sipeed.com/fileList/KVM/nanoKVM/HDK/02_Schematic/SCH_RV_Nano_KVM_B_30131.pdf)
 + [NanoKVM-A 原理图](https://cn.dl.sipeed.com/fileList/KVM/nanoKVM/HDK/02_Schematic/SCH_RV_Nano_KVM_A_30111.pdf)
 + [NanoKVM-B 原理图](https://cn.dl.sipeed.com/fileList/KVM/nanoKVM/HDK/02_Schematic/SCH_HDMI_MIPI_31011.pdf)
 + [NanoKVM 镜像下载](https://github.com/sipeed/NanoKVM/releases/tag/NanoKVM)