# Em7430 no com port after vid:pid change

**URL:** <https://forum.sierrawireless.com/t/em7430-no-com-port-after-vid-pid-change/30392>\
**Category:** MC/EM Series\
**Created:** [August 5, 2023, 6:29am UTC](https://forum.sierrawireless.com/t/em7430-no-com-port-after-vid-pid-change/30392 "2023-08-05T06:29:43Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**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:** [August 5, 2023, 1:42pm UTC](https://forum.sierrawireless.com/t/em7430-no-com-port-after-vid-pid-change/30392/6 "2023-08-05T13:42:25Z")

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Some idea like this one:

> [@Rescue MC7710 after incorrect PID change?](https://forum.sierrawireless.com/t/rescue-mc7710-after-incorrect-pid-change/7952/7):
>
> The router OS does not give more specific information, but I put it into a Linux box and got the full descriptor listed in the attachment below. But note that lsusb gives an error message (Couldn’t open device…) because there is no driver available. So it looks like only the product ID is incorrect. Before I messed up the product ID, the router OS listed 5 channels for this device, and the descriptor listing shows there are 5 interfaces, even though none is accessible. If everything else …

I also see the qcserial.c in MBPL usb driver where you might add your pid:

 ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/0/0e38069cfacf176e614887b6f372277da3fe37d3.png)

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