Just to be 100% clear and shed some light here about the ECU and other things with this bike.
It is not possible to "Brick" the ECU in this bike, it can always be written to.
(barring electrical damage, short circuit, backwards battery install- ie; physical damage)
It is not possible to lock it from being flashed over either.
What is 100% possible is for a dealer flash to fail, or load properly from Yamaha's equipment because it is done through the diagnostic connector at a very slow rate that takes 40 minutes or so.
It is also done through an interface that connects through the internet from the dealer's diagnostic tool to Yamaha's server somewhere in the world... any disruption in the data will cause a corrupted or incomplete file installation.... Hence error codes. Bad WIFI, poor cable or connections, overloaded ISP... many things will affect the outcome of this.
Also, if the ABS module was disconnected at some point, it is possible that it won't marry up with the ECU properly and give error codes and cause failure to start.
There have been many people that have had the recall done with my flash with no issues... It is not possible to have some that cannot be written to and some that cannot because they are all the same.😂😂
Ivan