> <@brenneke:matrix.org> Just finally got GOS flashed on new 4a. 
> No success using install instructions from GOS site using Powershell on new Windows 10 laptop, fastboot too old error despite 30.0.5+.
> Followed this guide on my Ubuntu 18.04 machine, worked perfectly:
> https://www.youtube.com/watch?v=oO0UFZjuotg
> Just sayin'. 
> 

You sure you followed it right?