adb shell sys_reboot bootloader
fastboot devices
fastboot flash boot E:\Firmware\SIM7200\2035B01SIM7200\Firmware\2035B01SIM7200\boot.img
fastboot flash system E:\Firmware\SIM7200\2035B01SIM7200\Firmware\2035B01SIM7200\system.img
fastboot flash userdata F:\ligang\sim7250\DownLoadTool\2033\userdata.img
fastboot reboot

fastboot getvar partition-size:system
fastboot getvar max-download-size