Hi,
When I put together the original DI-30 how-to, I was only interested in getting it to work with Taper and it did. I did eventually work it out for Flexbackup as well but another forum user beat me to an updated how-to to cover flexbackup as well (just search for it if you have not already done so).
The how-to should work (as I know many who use it to get their DI-30s working). All I can suggest is make sure you have the correct osst.o file loaded, check the insmod entries in rc.sysinit, make sure the device nodes have been created and you really should not need to append parameters to lilo for it to work.
Kelvin