Me too !!
I updated to Firmware Version:18.104.22.168.342 and now when I mount any
USB HDD or Flash drive fat32 or NTFS and I select USB application
the Media Server option is missing and also when I try to install
Download Master it runs through the setup ...
loading app list..
initilizing please wait..
the remote server is not responding..
and if I eject the USB disk , it starts installing the Download
Master and gets stuck at 99% ...
Im confused and unhappy RT-N56U