This seems to be the exactly same issue.
I´ll try this and see if it works "edit sd:/bootloader/nyx.ini and change bpmpclock=1 to bpmpclock=2 or 3"
If not, ill try the 6.2.2 version, but without the 19.0 firmware.
1729045642
It worked! I changed to bpmpclock=2 and now Hekate 6.2.1 is working...