Some little technical blog


Sierra Wireless EM7455: how to make it work with an older Lenovo laptop

Lenovo and other manufacturers, namely Dell are starting to use the newest Quallcomm 9×30 based cellular modems. The only modem manufacturer so far is Sierra Wireless and the model is XX7455, where XX is the form factor code. We’ll be using an m.2 modem, so our model number is EM7455. For the older generation laptops that only have a mini-PCI slot there’s the MC7455 model. Currently, the EM7455 is available as Sierra Wireless generic version (the model is EM7455), Lenovo version (the model is EM7455 as well), and Dell version (the model is DW5811e). All three versions are the same hardware, the only difference is the firmware and there are no restrictions for cross-flashing too.

EM7455 is not intended for use with the previous generation Lenovo laptops, such as X240, X1 Carbon Gen2, etc, but we’re going to fix that!

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Sierra Wireless EM7445: A dead-born king


As a natural development of their previous XMM7160 LTE chipset, Intel presented a new generation, named XMM7260. It was announced about 2 years ago and only now some first real devices made it to customers.
XMM7260 supports more LTE bands than XM7160 and also supports LTE carrier aggregation. It conforms to LTE Cat.6.

The following LTE bands supported: 1, 2, 3, 4, 5, 7, 8, 13, 17, 18, 19, 20, 25, 26, 29, 30, 38, 41

Wow, that’s 18 LTE bands supported!

The following LTE bands supported with carrier aggregation: 1+5, 8, 18, 19, 26; 2+4, 5, 13, 17, 29; 3+5, 8, 19, 20, 26; 4+5, 13, 17, 29; 7+20; 4+4


That technical details look very good and I was desperate to test the new Sierra Wireless EM7445. Below is my review.

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