Hey lads, in the process of flashing Graphene on my Pixel 4. So on the installation step where you have to execute ./flash-all.sh (I'm on Linux) I ran into an error:

./flash-all.sh: line 17: [: c7815d: integer expression expected
fastboot too old; please download the latest version at https://developer.android.com/studio/releases/platform-tools.html

Heres the thing though: the version I'm useing (adb is 30.0.3-6597393) is the latest version. I tried installing the SDK tools and obtaining fastboot from standalone platform tools, but I just end up copying the same file since it's the latest version.
Anyone else reported this?