AutoVEI – D2351S1021 – GS3 BSL – ZF GS3.0 / GS3.3 Read / Write in BSL mode

It’s a software license for the AutoVEI Truck Explorer tooling platform (VEI devices) that enables direct access to the ZF‑Astronic GS3 series transmission ECU.

Specifically, the license code D2351S1021 corresponds to the GS3 BSL license which enables reading and writing both Flash and EEPROM on GS3, GS3.3, and GS3.6 gearboxes.

This is not simply diagnostic access — it’s full memory access at the hardware level.