AT+CPIN? AT+CREG? AT+CGMR (firmware version)
: Open the SPD tool and load the firmware ( .PAC file) for your specific chipset (e.g., SC7731, SC9863A). spreadtrum sci usb2serial ok
: Select SCI Android USB2Serial from the list and finish the wizard. If a red warning about unsigned drivers appears, choose "Install this driver software anyway". Verifying the "OK" Status AT+CPIN
On the phone, a service /vendor/bin/sci_daemon : follow the "Add Legacy Hardware" method:
Since these drivers often require manual installation, follow the "Add Legacy Hardware" method: