Update rock5b installation method

build-armbian/documents/README.cn.md

@@ -237,6 +237,12 @@ Radxa-Rock5B 有 microSD/eMMC/NVMe 等多种存储介质可以选择，相应的
 
 ##### 8.2.1.2 安装系统至 eMMC
 
+使用 microSD 卡安装：将 Armbian 系统镜像写入 microSD 卡，将 microSD 卡插入设备并启动，上传 `armbian.img` 镜像文件到 microSD 卡，使用 `dd` 命令将 Armbian 镜像写入 NVMe 中，命令如下：
+
+```Shell
+dd if=armbian.img  of=/dev/mmcblk1  bs=1M status=progress
+```
+
 - 使用 USB 转 eMMC 读卡器安装：将 eMMC 模块与电脑连接，使用 Rufus 或者 balenaEtcher 等工具将 Armbian 系统镜像写入 eMMC 里，然后把写好系统的 eMMC 插入设备即可使用。
 - 使用 Maskrom 模式安装：关闭开发板电源。按住金色按钮。将 USB-A 转 C 型电缆插入 ROCK 5B C 型端口，另一端插入 PC。松开金色按钮。检查 USB 设备提示找到一个 MASKROM 设备。右键单击列表的空白区域，然后选择加载 `rock-5b-emmc.cfg` 配置文件（配置文件和 RKDevTool 在同一个目录下）。将 `rk3588_spl_loader_v1.08.111.bin` 和 `Armbian.img` 按下图所示设置，选择写入即可。
 
@@ -261,7 +267,7 @@ ROCK-5B 在主板上有一个 SPI 闪存，将引导加载程序安装到 SPI 
 </div>
 
 - 使用读卡器安装：将 M.2 NVMe SSD 插入 M.2 NVMe SSD 到 USB3.0 读卡器，以连接到主机。使用 Rufus 或者 balenaEtcher 等工具将 Armbian 系统镜像写入 NVMe 里，然后把写好系统的 NVMe 插入设备即可使用。
-- 使用 microSD 卡安装：将 Armbian 系统镜像写入 microSD 卡，将 microSD 卡插入设备并启动，上传 `Armbian.img` 镜像文件到 microSD 卡，使用 `dd` 命令将 Armbian 镜像写入 NVMe 中，命令如下：
+- 使用 microSD 卡安装：将 Armbian 系统镜像写入 microSD 卡，将 microSD 卡插入设备并启动，上传 `1rmbian.img` 镜像文件到 microSD 卡，使用 `dd` 命令将 Armbian 镜像写入 NVMe 中，命令如下：
 
 ```Shell
 dd if=armbian.img  of=/dev/nvme0n1  bs=1M status=progress

build-armbian/documents/README.md

@@ -236,6 +236,12 @@ Use tools such as Rufus or balenaEtcher to write the Armbian system image to the
 
 ##### 8.2.1.2 Install the system to eMMC
 
+- Install using microSD card: Write the Armbian system image to the microSD card, insert the microSD card into the device and boot it up, upload the `armbian.img` image file to the microSD card, and use the `dd` command to write the Armbian image to the NVMe, as follows:
+
+```Shell
+dd if=armbian.img of=/dev/mmcblk1 bs=1M status=progress
+```
+
 - Use USB to eMMC card reader for installation: Connect the eMMC module to the computer, and use tools such as Rufus or balenaEtcher to write the Armbian system image to the eMMC. Then insert the eMMC with the written system into the device to use.
 - Use Maskrom mode for installation: Turn off the development board power. Hold down the gold button. Insert the USB-A to C cable into the ROCK 5B C port, and the other end into the PC. Release the gold button. Check the USB device prompt to find a MASKROM device. Right-click on the blank area of ​​the list, and then select to load the `rock-5b-emmc.cfg` configuration file (the configuration file and RKDevTool are in the same directory). Set `rk3588_spl_loader_v1.08.111.bin` and `Armbian.img` as shown below, and select write.
 
@@ -260,7 +266,7 @@ Turn off the development board power. Remove the bootable device, such as MicroS
 </div>
 
 - Install using a card reader: Insert the M.2 NVMe SSD into the M.2 NVMe SSD to USB3.0 card reader to connect to the host. Write the Armbian system image to the NVMe using tools such as Rufus or balenaEtcher and then insert the NVMe with the written system into the device to use.
-- Install using microSD card: Write the Armbian system image to the microSD card, insert the microSD card into the device and boot it up, upload the `Armbian.img` image file to the microSD card, and use the `dd` command to write the Armbian image to the NVMe, as follows:
+- Install using microSD card: Write the Armbian system image to the microSD card, insert the microSD card into the device and boot it up, upload the `armbian.img` image file to the microSD card, and use the `dd` command to write the Armbian image to the NVMe, as follows:
 
 ```Shell
 dd if=armbian.img of=/dev/nvme0n1 bs=1M status=progress