# MC7455 Not Detected - Ubuntu18.04 **URL:** \ **Category:** MC/EM Series\ **Created:** [October 11, 2018, 4:26pm UTC](https://forum.sierrawireless.com/t/mc7455-not-detected-ubuntu18-04/14133 "2018-10-11T16:26:47Z")\ **Posts on this page:** 1\ **Showing post:** 10
**Author:** ![dl5162](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/dl5162/32/2169_2.png) [@dl5162](https://forum.sierrawireless.com/u/dl5162)\ **Post date:** [October 13, 2018, 7:09am UTC](https://forum.sierrawireless.com/t/mc7455-not-detected-ubuntu18-04/14133/10 "2018-10-13T07:09:33Z")
> [@jafar](#): > > No luck yet after taping those pins, here is the connector specs of the board I have, any suggestion? Sorry, I’m out of suggestions now. Your slot pinout looks fine, and covering pins s 7,11, 13, 23,25,31,33 on the MC7455 should have been enough. The only odd thing I noted about the pinout is pins 17 and 19. They are claimed to be NC **and** used by the SIM interface. Which doesn’t really make any sense. These pins are normally reserved for SIM, but rarely connected to anything. They are however part of the second SIM interface on the MC7455. Can’t imagine that this should cause any problems though. It’s most likely just an error in the pinout diagram, to be interpreted as “NC”. Note that you can probably get away with covering all the odd pins (i.e. all pins on the component side) on the MC7455 if you don’t need any of the WAKE\_HOST, GPIO, SIM2, USB3 or AUDIO signals. Which is often the case. At least for laptop/generic board usage. --- _[View the full topic](https://forum.sierrawireless.com/t/mc7455-not-detected-ubuntu18-04/14133)._