1. Using AndroidTool.

Step1 请先准备一条mirco USB 线材和Debug Cable

Mirco USB

Debug Cable

插一张Debug cable 图片

Step2 Double click DriverInstal

插一张DriverInstall图片

Step3 Enter into MASKROM mode .

There are two ways to enter MASKROM

1. Hardware way to enter MASKROM

Step1将Mirco USB的OTG端插在板卡的USB0_OTG1端口上，USB端插在PC上，如下图

插一张图片

Step 2 将底板ROM-DB5901的SW1（BOOT SEELECT）拨码如下

插一张SW1拨码开关的图片

Step 3 使用12V 3A的电源上电，并打开瑞芯微开发工具V2.65，如下图

插一张进入MASROM设备模式的图片

Step 4当板卡进入MASKROM模式后，将底板ROM-DB5901 SW1的4、5拨回OFF（1-6均为OFF），再点击“执行”开始进行烧录。

插一张ADB的图片

2. Software way to enter MASKROM

When the device boot up to android or debian, you can use ADB or Debug console, send command "reboot loader" .

Or Press "ctrl + c" key when booting into uboot, until get the following information on debug console :

'Android 10'：

<span style="background:#f6f6f6"><span style="background:#f6f6f6"><span style="line-height:14.4pt"><span lang="EN-US" style="font-size:10.0pt"><span style="font-family:" lucida="" console""=""><span style="color:black">Hit any key to stop autoboot: 0</span></span></span></span></span></span>

<span style="background:#f6f6f6"><span style="background:#f6f6f6"><span style="line-height:14.4pt"><span lang="EN-US" style="font-size:10.0pt"><span style="font-family:" lucida="" console""=""><span style="color:black">rkboot # <INTERRUPT></span></span></span></span></span></span>

<span style="background:#f6f6f6"><span style="background:#f6f6f6"><span style="line-height:14.4pt"><span lang="EN-US" style="font-size:10.0pt"><span style="font-family:" lucida="" console""=""><span style="color:black">rkboot # => rbrom</span></span></span></span></span></span>

<span style="background:#f6f6f6"><span style="background:#f6f6f6"><span style="line-height:14.4pt"><span lang="EN-US" style="font-size:10.0pt"><span style="font-family:" lucida="" console""=""><span style="color:black">I2c2 speed: 100000Hz</span></span></span></span></span></span>

'Debian 9.x'：

<span style="background:#f6f6f6"><span style="background:#f6f6f6"><span style="line-height:14.4pt"><span lang="EN-US" style="font-size:10.0pt"><span style="font-family:" lucida="" console""=""><span style="color:black">Hit any key to stop autoboot: 0</span></span></span></span></span></span>

<span style="background:#f6f6f6"><span style="background:#f6f6f6"><span style="line-height:14.4pt"><span lang="EN-US" style="font-size:10.0pt"><span style="font-family:" lucida="" console""=""><span style="color:black">rkboot # <INTERRUPT></span></span></span></span></span></span>

rkboot # rbrom

插一张loader图片

点击“高级功能”，进行选择，点击“进入Maskrom”，如下图所示：

插两张设置图片