增加kvm线刷流程中英

docs/hardware/en/kvm/NanoKVM/system/flashing.md

@@ -11,6 +11,8 @@ update:
 
 *The NanoKVM Full version comes pre-flashed with an image and can skip this step if desired.*
 
+## Burning the TF card using a card reader
+
 1. Prepare the SD Card:
 
     - The Full version comes with a 32G SD card. You will need to remove it by opening the case.
@@ -41,4 +43,27 @@ update:
 
 Congratulations! The image has been successfully flashed!
 
-You can now insert the SD card into the NanoKVM and proceed to the next steps.
+You can now insert the SD card into the NanoKVM and proceed to the next steps.
+
+## USB Update TF Card Image
+
+**Note: Using USB can only update the system; it cannot be used for the initial flashing.**
+Please ensure that the TF card already has the system installed and **the system can run normally** before using this method.
+
+- For **NanoKVM cube**:
+
+  - Power off the device, keeping the TF card inserted.
+  
+  - Use a sharp object like a toothpick or SIM eject tool to press down on the reset button located in the small round hole next to the USB-C port. While pressing down, connect the USB cable to the computer. Wait for the USB drive to appear on your computer, and once the `boot` drive icon shows up, you can release the tool.
+
+    ![select target](../../../../assets\NanoKVM\flashing\boot.png)
+
+  - Open `Etcher`, select the image file, choose the USB drive, and click `Flash`.
+
+    ![select image](../../../../assets/NanoKVM/flashing/select_image.png)
+
+  - Wait for the flashing process to complete. If your computer prompts you with a message like `You need to format the disk in drive G: before you can use it`, **do not** format the disk! If you do, the newly flashed system will be erased. Simply close the window, right-click the disk, and select "Eject" to safely remove the TF card.
+
+  - Then, disconnect the USB-C cable, power the device back on, and wait for the system to boot. The first boot may take a little longer, so it's recommended to wait for about 1 minute (until something appears on the screen). Do not power off during boot, as doing so may corrupt system files being processed (the solution for such corruption is to re-flash the image).
+
+> If you cannot enter USB upgrade mode, the system files may be corrupted. In this case, use a card reader to flash the TF card.

docs/hardware/zh/kvm/NanoKVM/system/flashing.md

@@ -11,6 +11,8 @@ update:
 
 *NanoKVM Full 版本出厂时已经烧录了镜像，可以选择跳过该步骤。*
 
+## 使用读卡器烧录TF卡
+
 1. 准备 SD 卡：
 
     - Full 版本自带一张 32G 的 SD 卡，需要拆开外壳将其取出；
@@ -42,3 +44,26 @@ update:
 恭喜！镜像烧录完成！
 
 现在，你可以将 SD 卡装到 NanoKVM 上，然后进行下一步的操作了。
+
+## USB 更新 TF 卡镜像
+
+**注意使用 USB 只能更新系统不能用作第一次烧录。**
+请保证 TF 里面已经有系统，并且**系统能正常运行**之后才能用这种方式。
+
+- 对于 **NanoKVM cube**:
+
+  - 断电，保持 TF 卡插入。
+  
+  - 使用牙签或卡针等尖锐物体插入USB-C旁的圆形小孔内（此处为reset键）向下按压，保持按压的同时插入 USB 线连接到电脑，等待 U 盘设备出现在电脑上，等待boot盘符出现后即可松开卡针。
+  
+    ![select target](../../../../assets\NanoKVM\flashing\boot.png)
+  
+  - 打开 `Etcher`，选择镜像文件，选择 U 盘设备，点击`Flash`。
+  
+    ![select image](../../../../assets/NanoKVM/flashing/select_image.png)
+  
+  - 等待烧录完成，如果电脑弹出`使用驱动器 G: 中的光盘之前需要将其格式化`这样的字符，**不要**点击格式化磁盘！不然刚烧录好的系统又被格式化了！ 关掉窗口， 右键磁盘，选择弹出 TF 卡即可。
+  
+  - 然后断开USB-C重新上电，等待系统启动，第一次启动会慢一点，等待一会即可（等待屏幕显示内容，保险起见等待1分钟左右），启动过程中不要断电，防止正在开机处理的文件损坏（解决方法是重新烧录镜像）
+
+> 如果发现进不了 U 盘升级模式，可能是系统文件损坏，使用读卡器烧录 TF 卡即可。