Oh dears

use halftux image,

or
Winx64 needs definitely libusb32 (or use older XP/Win7 as 32bit)
the 'cmd' / flasher needs definitely to be run as administrator
first fix this

then 'u' needs to be hold for first time until drivers are installed
for not detecting try following sequence
take battery out
connect USB
start cmd as administrator
go to directory
start the flasher command
push (and hold) 'u'
insert battery, hold down 'u'