I have the file you zipped to me.
When I open the L1 updater, after plugging into the T4s, the first item on the list is T1 Firmware DSP 1.8, followed by a series of T1 titles. There is no reference to T4S anywhere, just T1.
When I attempt to update, it immediately says the selected file is not compatible. Please select a compatible file.
I have countless units that periodically require firmware updates. None are as brain damaging as this.
Does the screen on your T4S have a blue background or a black background?
What version level is your ToneMatch® Mixer?
The device you are trying to update is a T1 ToneMatch® audio engine, not a T4S. That's why it won't accept the T4S file. It is up-to-date with firmware version 1.8.
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Before you go to all that trouble, did you follow the steps in the video?
You missed the step in the video where you put all the files in the same folder.
You need to put the *.bos file from this page
into the same folder as the L1 Updater program.
I just went through the steps on my machine. I created a folder called Bose and put the L1 Updater program and the *.bos file into it like this.
When I run the L1 Updater and click Update
and you should see
The update will start.
When the process is complete, there will be an error message
Click Cancel and the L1 Updater program will exit.
If you see this message, click OK
Important - Please read the following and reset the T8S to bring all your settings up to date.
If you have any difficulty completing these steps, please call Bose Support.
Bose® Product & Technical Support at (877) 335-2673
(U.S. and Canada only)
Monday-Friday: 9:00 AM - 9:00 PM ET