BLI Switcher problem???

I just got my first ever sound loco. It’s a BLI diesel switcher. The manual says to shut the engine down, press F9 twice. This has absolutely no effect at all. F1 & F2 work the bell and horn respectively and F3 clanks the couplers. F0 doesn’t turn the lights on either. I have a Digitrax Zephyr. I should be in 128 speed step mode. How do I check this?
As usual, I am appreciative of any and all suggestions.
MERRY CHRISTMAS toALL
BB

try to reset it