Attached is the Chinese datasheet automatically translated to English with most formatting there, but sometimes it is good to check the original it was generated from http://www.icofchina.com/d/file/xiazai/2017-05-02/ea0cdd3d81eeebcc657b5dbca80925ee.pdf
All those CASxx commands are there.
interesting conversation, I think they mostly turn off Beidou to make it faster?
I also downloaded stuff from http://www.icofchina.com/xiazai/# and build the agps demo source and it did download some binary agps data that is supposed to be pushed to the device but did not try that yet. At least in B5 firmware there is code that uses second GPS uart atached to different pins at 230400 speed so maybe that is the way to upload it (or maybe that is to update GPS firmware)
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