https://github.com/DFRobot/DFRobot_GDL
https://www.espressif.com.cn/sites/default/files/documentation/esp32-wroom-32e_esp32-wroom-32ue_datasheet_en.pdf
You can refer to the DFR0816 beetle board selection tutorial as the DFR0816 is a small pad version of the DFR0282.
https://wiki.dfrobot.com/Beetle_CM_32U4_SKU_DFR0816
This product can drive stepper motors but only stepper motors with two coils.
I used my 7-inch DSI screen, but there was no brightness or darkness and the Raspberry Pi's WiFi worked fine!
RX connection D8
TX connection D7
SIM7600 default baud rate 9600
If you want to modify the baud rate of the expansion board you can use the command "AT+IPREX=Baud Rate" to modify the default baud rate of the expansion board, this command will not change the baud rate after power down.
From your description there seems to be no problem.Do you have an external MAIN antenna? It is possible that the expansion board received a weak 4G signal caused by the failure to start.
What is your power supply range for arduino? Maybe you can ask your SIM card provider which band the SIM card is working in and if it includes the band in the chart below.
You can use "AT+IPR?" to query the current hardware baud rate to make sure your baud rate is set correctly. After determining the baud rate, use the "AT+CGPS" command to turn on the GPS, and finally enter "AT+CGPSINFO" to get the GPS data. Finally, please connect the antenna to use GPS outdoors otherwise the positioning will be inaccurate.
The “store”function needs to be implemented by software I2C, you can refer to python's software I2C writing method.https://github.com/DFRobot/DFRobot_GP8403/tree/master/python/raspberryPi
You can supply 7-24V power to it from the Vin pin of the expansion board
Can you describe in more detail, about updating SIM7000E on SIM7000 shield I am not sure how to update.In fact, SIM7000E and SIM7000 use the same library:https://github.com/DFRobot/DFRobot_SIM7000/tree/master/examples
Maybe you can try to change the I2C address, the following pictures are the result of my operation and connection after changing the I2C address.