Issue with 1.5.0 version and sap6_cp_9.0.0

Hi,
I used `sap6_cp_9.0.0.uf2` and the latest version firmware `1.5.0`. But for some reason, it only works while connected to usb. When I disconnect, I'm constantly getting red+green flashes (four times fast). I tried to extend the logger, to log DEBUG to the file, but I'm getting error that file system is read-only.

Have you experienced anything similar?