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May 1, 2021 Service bulletin

Telematics unit deactivation due to 3G cellular technology discontinuation

BMW technical service bulletin B840121 for 2014-2018 BMW X5, 2012-2016 BMW 328I and 2011-2017 BMW X3 and others.

Bulletin number
B840121
Component
Equipment: electrical
Summary
TELEMATICS UNIT DEACTIVATION DUE TO 3G CELLULAR TECHNOLOGY DISCONTINUATION: The discontinuation of 3G cellular communication for Combox, TCB 3G and ATM 3G (Telematics ControlModule) can no longer be supported by the cellular network provider starting February 2022.

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