lsusb shows: Code: Bus 002 Device 006: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode) while dsmesg outputs: Code: [342062.964718] usb 2-4: new high-speed USB device number 6 using ehci-pci [342063.092797] qcserial 2-4:1.0: Qualcomm USB modem converter detected [342063.093020] usb 2-4: Qualcomm USB modem converter now attached to ttyUSB0 unbrick_8960 seems to correctly recognize the device (but of course it outputs the devices it has the bits from). Having a quick look at unbrick.sh it just ls the folders in the devices folders, so we may easily add jolla to that list. The hexmbn may also contain something useful to us (just guessing).
Bus 002 Device 006: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode)
[342062.964718] usb 2-4: new high-speed USB device number 6 using ehci-pci [342063.092797] qcserial 2-4:1.0: Qualcomm USB modem converter detected [342063.093020] usb 2-4: Qualcomm USB modem converter now attached to ttyUSB0