Ensure your device actually uses a Spreadtrum/Unisoc processor.

If you have searched all over and still cannot find a verified SPD R420 driver, force Windows to identify the device using its Hardware ID.

https://www.realtek.com/en/component/zoo/category/pc-audio-codecs-high-definition-audio-codecs-software

The is a critical software component for Windows that allows your PC to communicate with devices powered by Unisoc/Spreadtrum processors. It is primarily used for flashing firmware, data recovery, and system maintenance using tools like the SPD Flash Tool (ResearchDownload or UpgradeDownload). 📥 Verified Download Sources

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Once you have downloaded the verified driver package (e.g., SPD_R420_Verified_v2.3.zip ), follow these instructions:

Verified signatures to bypass Windows Driver Signature Enforcement in most cases. Download SPD Driver R420 (Verified Link)