Updated to the latest Vial version(v.0.7.4).
https://get.vial.today/changelog/release-0.7.4.html

Added https://github.com/Squalius-cephalus/silakka54/pull/19

There is two different version, if silakka54_vial_LEFT.uf2 / silakka54_vial_RIGHT.uf2 does not work, use NO_USBDETECT version.

NO_USBDETECT is missing these lines from config.h: #define SPLIT_USB_DETECT #define SPLIT_USB_TIMEOUT_POLL 10 #define SPLIT_WATCHDOG_ENABLE #define SPLIT_WATCHDOG_TIMEOUT 3000

Remember to backup your layout!