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HP EliteBook 840 G7 Notebook PC IDS Base Model

I have some Elitebook 840 G7 notebooks that will replace older G5 and G6 models. The problem is that older models have LTE modems and G7's don't so I switched them but Huawei from G5 is not listed in devices manager and Fibcom (intel XMM 7360) is installed with correct name but as a system device, not a network card so it's not available to use. I checked that G7's use G7 from factory so I used drivers from HP support but the problem persists, no matter how I install Windows. I haven't found any additional options in UEFI, modems work fine in G5 and G6 so they are not the problem. Is there something that has to be done to run LTE modem? 

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