The tool interfaces with devices in "Diag Mode" to execute several critical repair operations:

: Writing or repairing IMEI numbers on Spreadtrum-based phones. Firmware Recovery

The SPRD U2S Diag Reset Tool is a niche but essential utility for anyone repairing or modding Unisoc-based devices. It won’t flash firmware or fix corrupted partitions, but it can bring a seemingly dead device back from diag purgatory in seconds.