Yes, u37 looks like it.
thank you so much for your helpful advice! I'm up and running again and very happy.
No problem.
For the record: I put what I did for my specific model on http://opensource.holgerbrunn.net/debian-on-acer-cb5#unbricking
I seem to have done something stupid when shorting the three pins supposed to be connected to 3.3V, this didn't work. But when I disconnected the first pin and connected the other to the second 3.3V on the PI, the chip was recognized. Is it safe to propose the same to other people or was it beginner's luck I didn't damage anything with this wiring?
No, generally you don't need to short the 3 pins. In fact the second 3.3v you connected may not have been necessary either. I haven't damaged any of the Chromebooks I've had doing that, and I must've had about a dozen at this stage.
Regards, Holger
Regards,
John.