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I think it should be J2. Not P2. We released the Arduino library for WisLTE, which you can view here：https://github.com/RAKWireless/WisLTE_Arduino
As you can see from the schematic diagram, our I2C pin are connected to other things, affecting Arduino's I2C.
I'm sorry for replying to you now. Please update the firmware for the problem you mentioned.
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