After coreelec 9.2 is installed in EMMC, it cannot start emuelec from SD card

After coreelec 9.2 is installed in EMMC, it cannot start emuelec from SD card
My device is x96max +, s905x3 4GB
The SD card installs the emuelec. After I install the coreelec into the EMMC single boot mode, the device starts the coreelec. Insert the SD card to start the system. The background picture is the emuelec, but the system is still the system that coreelec cannot enter the SD card. Ask for help!!!

在EMMC中安装coreelec 9.2后,它将无法从SD卡启动emuelec

我的设备是x96max+,s905x3 4GB

SD卡安装Emulec。在我将coreelec安装到EMMC单引导模式后,设备启动coreelec。插入SD卡以启动系统。背景图片是Emulec,但系统仍然是Corelec无法进入SD卡的系统。寻求帮助