If Windows blocks installation due to driver signature enforcement (riskier; only if you trust the source):
Open Command Prompt as Administrator and run:
bcdedit /set testsigning on
Reboot. You’ll see "Test Mode" watermark bottom-right of desktop – that’s your green light.
While in Test Mode, unsigned drivers are allowed but sometimes still blocked. To be safe, also run:
bcdedit /set nointegritychecks on
Reboot again.
If you frequently use CoolSand RDA devices, you can enable Test Mode to permanently allow unsigned drivers:
Security Note: Test Mode weakens system protection. Only use on a dedicated repair machine or disable after flashing. coolsand rda usb driver 64-bit windows 10
Coolsand (later acquired by Spreadtrum/UNISOC) produced ultra-low-cost GSM/EDGE baseband processors. Think:
The RDA USB Driver is not a single file—it’s a cocktail of:
On 32-bit Windows 7, life was simple. On 64-bit Windows 10? Driver Signature Enforcement (DSE) says "No."
Q: Does this driver work on Windows 11 64-bit?
A: Partially. Windows 11 has stricter HVCI (Memory Integrity). You must disable Core Isolation → Memory Integrity in Windows Security, then follow the same Test Mode steps.
Q: I have a CoolSand RDA 8851 – is this driver compatible?
A: Yes. The driver uses generic USB classes (CDC ACM) and works across RDA 88xx series, including 8851, 8852, 8810, and 8811.
Q: The driver installs, but my phone keeps disconnecting.
A: Most likely a power management issue. Go to Device Manager → Universal Serial Bus controllers → right-click each “Root Hub” → Properties → Power Management → uncheck “Allow the computer to turn off this device”. If Windows blocks installation due to driver signature
Q: Can I use this driver for data recovery from a dead screen?
A: Only if the phone already boots to Download Mode blindly or if you can enter preloader via key combos. For standard MTP file transfer, you need ADB drivers, not RDA USB drivers.
Installing the Coolsand RDA USB Driver is essential for connecting budget "feature phones," smartwatches, and other devices powered by the Coolsand RDA chipset to your computer. These drivers allow your Windows 10 64-bit PC to communicate with the device for tasks like firmware flashing, IMEI repairing, or data recovery. Why You Need the Coolsand RDA USB Driver
The Coolsand RDA chipset, often found in System-on-Chip (SoC) configurations like the SC6533G, is common in low-cost mobile hardware. Without the correct driver, your computer may label the device as an "Unknown USB Device" or fail to recognize it entirely during forensic or flashing operations. Driver Specifications & Compatibility
The most recent versions of these drivers are designed to support a wide range of Windows environments:
Operating System: Windows 10, Windows 11, 8.1, 8, and 7 (64-bit and 32-bit versions).
Common File Names: sp113813.exe, RDA-USB-driver.exe, or signed ZIP archives like rda-driver-v1.2-signed.zip. Open Command Prompt as Administrator and run: bcdedit
Hardware IDs: Often identified by strings such as USB\VID_0525&PID_A4A7 or USB\CLASS_FF. How to Install on Windows 10 64-Bit
There are two primary methods to install these drivers: using an executable installer or a manual setup via the Device Manager. Method 1: Using the Executable (.exe) Installer
Download and Extract: Obtain the latest driver package and unzip the files if they are in a compressed format.
Clean Installation: Uninstall any previously installed RDA drivers to avoid conflicts.
Run as Administrator: Right-click the installer (e.g., RDA-USB-driver.exe) and select Run as administrator.
Wizard Setup: Follow the prompts in the InstallWizard, clicking Next and then Install. Windows may show a security warning; select "Install this driver software anyway" to proceed. Method 2: Manual Installation via Device Manager If the .exe fails, you can install the driver manually: