Bkool cadence issue

I have a Bkool Smat 2 trainer the yellow one. Working with zwift for a couple of years. Then last week, the trainer stopped being controllable, and the cadence on Zwift won’t show higher than 62, even when approx 100. I used the Bkool toolkit appt to update the firmware, now the controllable aspect is back (I can feel the hills), the watts seem sensible, but the cadence still is totally wrong. Any ideas, anyone?