Thank you very much for sharing.
I am having exactly the same problem that I am stuck in “Rebooting in bootloader mode”
Windows is fully up to date.
I even tried to follow the steps here according to the guide suggested by SuzieQ: GS290 No recognition on PC
But, the problem is that when I connect the phone in recovery mode, it is not recognized by windows neither.
In the device manager the GS290 is listed under USB devices.
When I right click on it for updates, it says Windows determined that the best drivers are already installed.
I even installed Android Studio hoping that that might change something, but, still the same, always stuck in “Rebooting in bootloader mode”
I am running windows 10 on a Thinkpad t440
The easyinstaller is version 0.12.1.
Thank you all.