@Igor I compiled and ran the tests for your latest driver and found that it would not correctly enroll my fingerprint on the Asus UX490UA which uses the ELAN 04f3:0903 device.

This is the output:

====================================================

This program will enroll your right index finger, unconditionally overwriting any right-index print that was enrolled previously. If you want to continue, press enter, otherwise hit Ctrl+C

fp:debug [fp_init] 
fp:debug [register_driver] registered driver upekts
fp:debug [register_driver] registered driver aes3500
fp:debug [register_driver] registered driver aes4000
fp:debug [register_driver] registered driver aes2501
fp:debug [register_driver] registered driver aes2550
fp:debug [register_driver] registered driver uru4000
fp:debug [register_driver] registered driver vcom5s
fp:debug [register_driver] registered driver upeksonly
fp:debug [register_driver] registered driver aes1610
fp:debug [register_driver] registered driver aes1660
fp:debug [register_driver] registered driver aes2660
fp:debug [register_driver] registered driver vfs101
fp:debug [register_driver] registered driver vfs301
fp:debug [register_driver] registered driver vfs5011
fp:debug [register_driver] registered driver upektc
fp:debug [register_driver] registered driver upektc_img
fp:debug [register_driver] registered driver etes603
fp:debug [register_driver] registered driver vfs0050
fp:debug [register_driver] registered driver elan
fp:debug [find_supporting_driver] driver elan supports USB device 04f3:0903
fp:debug [find_supporting_driver] selected driver elan supports USB device 04f3:0903
Found device claimed by ElanTech Fingerprint Sensor driver
sync:debug [fp_dev_open] 
async:debug [fp_async_dev_open] 
elan:debug [dev_init] 
async:debug [fpi_drvcb_open_complete] status 0
sync:debug [sync_open_cb] status 0
Opened device. It's now time to enroll your finger.

You will need to successfully scan your finger 5 times to complete the process.

Scan your finger now.
sync:debug [fp_enroll_finger_img] 
async:debug [fp_async_enroll_start] starting enrollment
fp:debug [generic_acquire_start] action 1
elan:debug [dev_activate] 
elan:debug [elan_activate] 
elan:debug [elan_dev_reset] 
drv:debug [__ssm_call_handler] 0x10bac00 entering state 0
elan:debug [elan_run_cmd] 4019
sync:debug [fp_enroll_finger_img] elan will handle enroll stage 0/4
elan:debug [elan_cmd_cb] 
elan:debug [elan_cmd_cb] transfer timed out
drv:debug [fpi_ssm_mark_aborted] error -110 from state 0
drv:debug [fpi_ssm_mark_completed] 0x10bac00 completed with status -110
elan:debug [activate_complete] 
fp:debug [fpi_imgdev_activate_complete] status -110
async:debug [fpi_drvcb_enroll_started] status -110
sync:debug [sync_enroll_cb] result -110
sync:error [fp_enroll_finger_img] unrecognised return code -110
sync:debug [fp_enroll_finger_img] ending enrollment
async:debug [fp_async_enroll_stop] 
elan:debug [dev_deactivate] 
elan:debug [elan_deactivate] 
elan:debug [elan_dev_reset] 
drv:debug [__ssm_call_handler] 0x10bac00 entering state 0
elan:debug [deactivate_run_state] 
elan:debug [elan_run_cmd] 000b
elan:debug [elan_cmd_cb] 
elan:debug [elan_cmd_cb] transfer timed out
drv:debug [fpi_ssm_mark_aborted] error -110 from state 0
drv:debug [fpi_ssm_mark_completed] 0x10bac00 completed with status -110
elan:debug [deactivate_complete] 
fp:debug [fpi_imgdev_deactivate_complete] 
async:debug [fpi_drvcb_enroll_stopped] 
sync:debug [enroll_stop_cb] 
Enroll failed with error -22
sync:debug [fp_dev_close] 
elan:debug [dev_deinit] 
elan:debug [elan_dev_reset] 
async:debug [fpi_drvcb_close_complete] 
sync:debug [sync_close_cb] 
fp:debug [fp_exit]