Tomato Firmware v1.28.8752 ND USB Ext
USB support integration and GUI,
Linux kernel 188.8.131.52 and Broadcom Wireless Driver 184.108.40.206 updates
Under USB and NAS > USB Support — Check Core USB Support, USB 2.0 Support, USB Storage Support, Ext2/Ext3 and NTFS support.
Click Save and it starts "Settings saved. Some services are being restarted…" after which the "Core USB Support" is disabled.
Have tried only enabling the Core and savings and/or other variations with same results.