Dragonboard 410C fastboot rootfs run stop

when i try fastboot according to https://www.96boards.org/documentation/consumer/dragonboard/dragonboard410c/installation/linux-fastboot.md.html,no problem in front until sudo fastboot flash rootfs lianro…,when i run sudo fastboot flash rootfs linaro…,it always stop here(as the fllowing picture)

anybody can help me ,i have trobling in this problem for a long time. Thanks !

I suggest to try recovery (e.g. via EDL mode): https://www.96boards.org/documentation/consumer/dragonboard/dragonboard410c/installation/board-recovery.md.html and then retry to flash.

thx , i will try this methon .