It's not possible to upgrade the modem to 4G.
The modem is part of the main comms board and that alone is ~£1,500. There are also other modules which differ making later modules incompatible with earlier ones.
I've attached pics of a later MY comms board.
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MY17 XC90 D5 Powerpulse Momentum: SENSUS, Osmium Grey, Blond, Walnut, Xenium, BLIS + CTA & RCM, Winter Plus, Fuel-fired Heater, Heated Rear Seats, Power Extensions, Tinted Windows
Coming soon: XC60 Ultimate Recharge MY24 or 25 or...
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