Hi yesterday I tried to install GrapheneOS and something is not working. 
I followed this https://youtu.be/xIXAzA555xk?t=344 guide except I skipped the Verifying part as suggested in the vid.
I am using a pixel 3a and windows 10 pc to do this.
Everything worked fine up to clicking on flash-all. after i clicked it the command promt came up but was mostly blank and disappeared
in less then a second.I think i saw a few words in red text before is disappeared the first time but i do not know what it said. 
and every time since it has been completely blank then disappeared. I'm sorry please be patient as I am bad at typing and spelling so my responses will be slow.