FW: To enhance ESD performance, prevent electrostatic damage to the PIN modem EG12-EA

Dear Kerr.Yang-Q!

  1. Before using the QFlash utility, is it necessary to short-circuit USB_BOOT and GND?

Do not short connect the USB_BOOT pin and gnd of the EG12 module, just hang in the air.EG12 provides a USB_BOOT pin. Pulling up USB_BOOT to VDD_EXT before power-on will make the
module enter emergency download mode when powered on. In this mode, the module supports firmware
upgrade over USB interface.However, it is not necessary to short-connect USB_BOOT and VDD_EXT before starting up the module. This method is mainly used for mass production upgrade in the production line. USB DM port can be used for normal debugging.