have you removed the uSD card while booting the flash drive ?
there's a risk of "contamination" ....
you could also try Sysupgrade help for x86_64 - #14 by frollic as an alternative way of upgrading.
have you removed the uSD card while booting the flash drive ?
there's a risk of "contamination" ....
you could also try Sysupgrade help for x86_64 - #14 by frollic as an alternative way of upgrading.