K1 MAX calibration/bed leveling not working

Hello all,

I’ve upgrade my K1 MAX with the CFS kit. Sofar printing with PLA is working fine. If you run through the self-check in the settings menu it does the bed levelling correctly at 50°. But when I want to print ABS and I check the calibration box when starting the print I get an error message AC0511 and some Chinese text. I don’t mind about the flow calibration stuff, but I would like to have the bed levelling. There is quite some difference in bed shape / flatness between 50° and 100°

Same on K1 with cfs. bed leveling won’t work. Firmware 2.3.5.33.

All new prints are faile on the first layer. S