Maybe it is caused by that the single is not switched to the new stereo.
By the way, what is the exact brand of car stereo did you get? some car stereos don't support to keep the original CCC or iDrive system.
I have recently upgrade my BMW stereo with XTRONS Q series, they keeps the original functions well and it has Qualcomm processor, Built-in 4G and so on.
Android screen upgrade to 2009 E83 with original GPS
in Audio & In Car Entertainment
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Maybe it is caused by that the single is not switched to the new stereo.
By the way, what is the exact brand of car stereo did you get? some car stereos don't support to keep the original CCC or iDrive system.
I have recently upgrade my BMW stereo with XTRONS Q series, they keeps the original functions well and it has Qualcomm processor, Built-in 4G and so on.