Undo the TSB

I made a software change to a program I am running at work today that controls a motion of a device. It add 200ms to a delay before the start of one function following the stop of another function. It does nothing else. One change, one affect. Yes, its possible.

 

Possible and probable are very different

 

I guess without us knowing the specifics of the TSB software changes, we can only speculate what all was actually changed.

No conclusive proof as to who's right or wrong on what was changed but I think the symptoms listed in the TSB sort of cull the herd to prevent everyone from demanding it.

 

The trans needs to relearn all over again, it will drive funny for a few weeks, no different than the first week of ownership.

You absolutely cannot revert versions with toyotas flashing methods, only approved ecu versions are accepted by the techstream software. Even if you could go back, I would never consider it.