Hi,
the following config allows to switch the device from storage mode to printer + storage mode
# Dymo LabelManager 420P
DefaultVendor= 0x0922
DefaultProduct=0x1003
TargetVendor= 0x0922
TargetProduct= 0x1004
MessageEndpoint= 0x01
ResponseEndpoint=0x01
MessageContent="1b5a01"
greets