Toyota Firmware 89663-42J90-A_AVT_Stage1_E2.bin
A catalog overview of Toyota firmware 89663-42J90-A_AVT_Stage1_E2.bin and its calibration and variant labels.
89663-42J90-A_AVT_Stage1_E2.bin is a Toyota-family engine control calibration file. The 89663 part-number family is associated with engine control computer software, which supports functions such as fuel delivery, ignition timing and emissions control. Those functions affect how the engine responds to the driver and operates under different conditions.
The related catalog entry 89663-42J90 identifies the underlying calibration family. The longer filename adds A_AVT_Stage1_E2, which appears to label a modified variant rather than establish a specific Toyota or Lexus vehicle application.
What the variant label says
Stage1 commonly describes a tuning variant, but the name alone does not establish its power output or the parameters changed. The meaning of AVT and E2 is not clear from the catalog names, so no particular feature can be assigned to either label.
The filename identifies a calibration-related file, not proof that the revision changes every function controlled by the engine computer. Exact vehicle fitment and the differences from a stock calibration require additional identification.