step1 connect
FlashToolCLI.exe --cfgfile config_ec617.ini --port COM47 probe

step2 erase
FlashToolCLI.exe --skipconnect 1 --cfgfile config_ec617.ini --port COM47 flasherase 0 0x400000

step3 burn
FlashToolCLI.exe --skipconnect 1 --cfgfile config_ec617.ini --port COM47 burnbatch --imglist bootloader system flexfile0 flexfile1

step4 reset
FlashToolCLI.exe --skipconnect 1 --cfgfile config_ec617.ini --port COM47 sysreset