If you intend to service, flash, or unlock a Spreadtrum-powered device, your PC must recognize the device in specific boot modes (such as DIAG mode, Download mode, or BROM mode). Without the R420 driver, you will likely encounter the following issues:
How to Safely Download the SPD Driver R4.20 Repack for Spreadtrum Devices spd driver r420 download repack
Click and accept any red Windows Security warnings by selecting "Install this driver software anyway." Click Finish and restart your computer. Verifying the Installation If you intend to service, flash, or unlock
Some GitHub developers have taken the original R420 INF files and re-signed them with a modern, trusted certificate. Search for "R420 driver with EV signature". These are technically "repacks" but are safer because they are open-source. Search for "R420 driver with EV signature"
: Try switching from a USB 3.0 port (blue port) to a USB 2.0 port (black port). USB 3.0 ports often cause synchronization errors with older smartphone bootloaders.
Without this driver, your PC will only recognize your phone as a charging storage device, preventing advanced service tools from accessing the phone's internal memory partitions. Key Use Cases
Once the wizard reports successful installation for all components, click and restart your computer. Manual Installation Alternative