Toyota and Lexus 89663-30E50-A Firmware

stok_89663-30E50-A.bin is a stock firmware file associated with the Toyota and Lexus identifier 89663-30E50. The stok label identifies it as a stock variant, rather than naming a specific modification or feature.

The 89663 part-number family is associated with engine control software. That makes an engine control module association plausible, but the catalog identifier alone does not establish the exact vehicle application or a specific function changed by this revision.

In general, an engine control module uses sensor inputs to manage functions such as fuel delivery and ignition timing. Those are functions of the controller family, not confirmed changes introduced by 89663-30E50-A.