How to clean Tegra B's file from Tegra A

Now I can not enter my Tegra B, maybe cause I set the recording directory to local storage and make it full.
So how can I clean the file from Tegra A?

Dear mrsunwen,

There are two way to access to TegraB.

  1. ssh
    TegraA :, TegraB :
    on TegraA terminal.
    $ssh nvidia@

  2. minicom
    On host machine terminal.
    $sudo minicom -D /dev/ttyUSB6

    Please refer to below link in detail for minicom setup.

Dear Steve,

Now I cannot open my TegraA.
I tried $ssh nvidia@ in TegraB but it appeared ‘1 package can bu update 0 update are security updates. ***/dev/mmcblk0p3 will be checked for errors at next reboot ***’

Thank you!