For LTE signaling debug:
cat /dev/ttyUSB0 > lte_logs.txt # Linux
Or use Spreadtrum Logger Pro to parse RRC/NAS logs. sprd u25 diag driver work
Run your Spreadtrum_USB_Driver.exe installer. Once finished, plug your phone in. For LTE signaling debug:
cat /dev/ttyUSB0 > lte_logs
The SPRD U25 Diag Driver is a proprietary software driver that enables diagnostic communication between a host PC and a device powered by a Unisoc U25 chipset (commonly found in IoT modules, feature phones, or low-end smartphones). It uses a proprietary diag protocol over interfaces like USB or UART to access internal chipset logs, memory dumps, modem states, and other debug information. Or use Spreadtrum Logger Pro to parse RRC/NAS logs