EM7455 with product ID 0x9078?


Hi, I got a EM7455 that has a product ID of 0x9078. Shouldn’t it be the same as the MC7455 which has product ID 0x9071?

Should I change it to 0x9071?

Right now this EM7455 is on my Sierra Dev Kit board, and it is not even enumerating properly. I am powering the Dev Kit board using the barrel power adapeter.

[97261.826454] usb 1-2: new high-speed USB device number 6 using ehci-pci
[97262.154037] usb 1-2: config 1 interface 0 altsetting 0 bulk endpoint 0x1 has invalid maxpacket 64
[97262.154127] usb 1-2: config 1 interface 0 altsetting 0 bulk endpoint 0x81 has invalid maxpacket 64
[97262.159906] usb 1-2: New USB device found, idVendor=1199, idProduct=9078
[97262.159915] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[97262.160051] usb 1-2: Product: Sierra Wireless EM7455 Qualcomm
[97262.160104] usb 1-2: Manufacturer: Sierra Wireless, Incorporated
[97262.160109] usb 1-2: SerialNumber: LF65233189021020
[97262.194324] usb 1-2: USB disconnect, device number 6



I would suggest changing the PID back for one of the predefined ones yes as the one you have quoted is not in the firmware list. As a result the Sierra Wireless drivers will not cater for this VID/PID combination hence it is not enumerating properly.

APP : 9071
BOOT: 9070

9071, 9070
68A2, 68A2
68B1, 68B0
68C0, 68C0
9068, 9068






We have looked a little closer at the unit and it appears that it is not a generic M2M unit but one we have sold to another company for who we highly customise the products. This explains the odd PID and it also mans that it could be setup in any sort of way potentially making it useless to you (we cannot change this to a standard unit outside the factory).

I suggest you buy a unit from an authorised distributor.




Well received and many thanks.