# EM7455B missing /dev/ttyUSB **URL:** \ **Category:** MC/EM Series\ **Created:** [April 3, 2024, 2:40pm UTC](https://forum.sierrawireless.com/t/em7455b-missing-dev-ttyusb/31993 "2024-04-03T14:40:46Z")\ **Posts on this page:** 1\ **Showing post:** 4
**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:** [April 3, 2024, 3:13pm UTC](https://forum.sierrawireless.com/t/em7455b-missing-dev-ttyusb/31993/4 "2024-04-03T15:13:34Z")
how about echo new id to the driver? > [@EM7455 Linux Issues](https://forum.sierrawireless.com/t/em7455-linux-issues/9086/4): > > Sure, no problems. But please take it calm and easy and don’t do anything more hasty wink Your modem had a Dell specific ID. This is made up of both a vendor ID (which belongs to Dell) and a product ID, which was assigned by Dell. The WIndows drivers know this exact combination. You changed half of that device ID, by changing the product ID. So you now have a bastard modem with a Dell vendor ID and Sierra Wireless product IDs. This combination is not recognized by neither Windows nor L… --- _[View the full topic](https://forum.sierrawireless.com/t/em7455b-missing-dev-ttyusb/31993)._