The (marketed as Tiger T310 or U25) is a 4G/LTE smartphone SoC from Unisoc. It integrates:
When you connect a Spreadtrum phone to a PC, it usually identifies as a Media Transfer Protocol (MTP) device or a standard Android ADB interface. For tools like , the phone needs to switch to a COM Port interface. The U25 Diag driver forces this handshake, allowing the software to send low-level commands to the baseband processor. sprd u25 diag driver work
On PC, run lsusb (Linux) or open Device Manager (Windows). You should see Spreadtrum Phone or Unisoc Phone with interface ff/ff/ff . The (marketed as Tiger T310 or U25) is