Since "zlcpe5g" appears to be a specific hardware identifier (likely a 5G Customer Premises Equipment or dongle) and the request is high-level, I have designed a comprehensive development plan and implementation skeleton for the firmware work.
return 0;This is the most critical part of 5G firmware. It manages the Qualcomm or MediaTek modem chipsets inside the device. The firmware contains the "protocol stack"—the set of rules governing how the device talks to the cell tower. zlcpe5g firmware work
echo -e "AT+QNWLOCK=\"common/5g\",1,78\r" > /dev/ttyUSB2