Hold the or Volume Down key (the boot key varies by device) and connect it to the PC.
The keyword is not just a search term—it is a safety requirement. By following this guide, you will secure a legitimate, malware-free driver and get your POS hardware running properly.
Supports Windows XP, 7, 8, 10, and 11 in both 32-bit and 64-bit architectures.
: After installation, connect your device in "Flash Mode" (usually by holding Volume Down while plugging it in). It should appear as "SPRD U2S Diag" or "SCI USB2Serial" in the COM & LPT section of the Device Manager. Safety & Verification
Hold down the key on your keyboard while clicking Restart in the Windows Start Menu. spd driver r420 download verified
Automatic installers ( DPInst32.exe for 32-bit systems and DPInst64.exe for 64-bit systems).
If your OS is already running but you need to update a driver:
You can download the verified driver package compatible with Windows 7, 8, 10, and 11 (both 32-bit and 64-bit) below: SPD_Driver_R4.20.0.zip Version: R4.20.0 File Size: ~20 MB Status: Tested & Verified (Virus Free) [Download SPD Driver R4.20.0 Here] Key Features of R420 Version
Navigate to > Advanced options > Startup Settings > Restart . Hold the or Volume Down key (the boot
Double-click DPInst.exe and follow the on-screen wizard to complete the installation.
If you have landed on this page, you are likely searching for the . Whether you are troubleshooting a hardware error, reinstalling Windows, or setting up a legacy point-of-sale (POS) system, finding a clean, verified driver is crucial. Installing an unverified driver can lead to system crashes, malware infections, or peripheral malfunctions.
: Choose either the x86 (32-bit) or x64 (64-bit) version depending on your Windows architecture.
If your computer still fails to recognize your phone after the automated setup, use this fail-safe manual method: Right-click the Windows Start Menu and open . Turn off your Spreadtrum phone completely. Supports Windows XP, 7, 8, 10, and 11
You have two options here:
A truly "verified" file has characteristics that can be checked for safety and authenticity:
. They provide a collection of manual installation files, including SCI and USB drivers.
Before you click that download button, review this verification checklist:
Quickly right-click that device before it disappears and select . Choose Browse my computer for drivers .