The eSeSIX WLVI03 has a standard Phoenix AwardBIOS - hit the DEL key repeatedly on power-up in order get into the BIOS setup screens.
The first/second/third boot device can be set to:
Setting the boot device to USB-HDD let me boot Tiny Core 4.7.6 from a 1GB pen drive.
Any comments? email me. Last update May 2013