test if modeswitch works
$ sudo usb_modeswitch -v 0x12d1 -p 0x1f01 -M "55534243123456780000000000000a11062000000000000100000000000000"
if yes than usually you would do this (but for me it did not work)
#edit config file
/etc/usb_modeswitch.conf
#add some stuff
#Huawei E303
DefaultVendor= 0x12d1
DefaultProduct= 0x1f01
TargetVendor= 0x12d1
TargetProduct= 0x14dc
MessageEndPoint = "0x01"
MessageContent="55534243123456780000000000000a11062000000000000100000000000000"
NoDriverLoading=1
#test config file with
sudo usb_modeswitch -c /etc/usb_modeswitch.conf
instead we try to add a udev rule:
#add udev rule
cat /etc/udev/rules.d/75-usb-modeswitch.rules
#huawei e303
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1f01", RUN+="/usr/sbin/usb_modeswitch -v 0x12d1 -p 0x1f01 -M '55534243123456780000000000000a11062000000000000100000000000000'"
you can test if it is working using
#test udev admin hooks
sudo udevadm trigger --action=add
then, check output of $ lsusb it it changed.
if it seems working do a reboot $ sudo reboot
log in again and check if it is there with $ lsusb
product id 14dc is there--> looks good!
lsusb modes: source (https://www.raspberrypi.org/forums/viewtopic.php?t=18996) 12d1:14db: network mode 12d1:1f01 - CD Mode 12d1:14db - Web Mode / HiLink 12d1:1442 - Serial Mode
may be check 55534243123456780000000000000011062000000100000000000000000000
Good this works :)