# EM7455 not recognised anymore after usbmode change **URL:** \ **Category:** MC/EM Series\ **Created:** [January 8, 2025, 9:21am UTC](https://forum.sierrawireless.com/t/em7455-not-recognised-anymore-after-usbmode-change/34271 "2025-01-08T09:21:36Z")\ **Posts on this page:** 1\ **Showing post:** 17
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [January 10, 2025, 9:58am UTC](https://forum.sierrawireless.com/t/em7455-not-recognised-anymore-after-usbmode-change/34271/17 "2025-01-10T09:58:41Z")
this user had applied a nvu file to change PID: > [@Em7430 no com port after vid:pid change](https://forum.sierrawireless.com/t/em7430-no-com-port-after-vid-pid-change/30392/25): > > oh god, i did fix this by many many wierd steps on both Windows10 and Ubuntu 20.04, thanks you @dl5162 , this .nvu is helpful to change the pid, so driver and usb bus can be detected, my works are: using physical pc, dont use virtual machine with usb passthrough because the vm host will not detect usb bus without driver Clean the hardware, m2 pin, m2 adapter pin to avoid pin missing or short must know the device usb setting, i remember it was 3 so i plug it on usb 3.0 port Plug in on windows 1… --- _[View the full topic](https://forum.sierrawireless.com/t/em7455-not-recognised-anymore-after-usbmode-change/34271)._