參考資訊：
https://forum.xda-developers.com/t/pixel-3-xl-only-fastboot-but-doesnt-accept-commands.3904235/
解法如下：
$ cd
$ wget https://github.com/steward-fu/website/releases/download/pixel-3a-xl/platform-tools_r33.0.3-linux.zip
$ unzip platform-tools_r33.0.3-linux.zip
$ export PATH=~/platform-tools:$PATH
$ fastboot --version
fastboot version 33.0.3-8952118
Installed as /tmp/platform-tools/fastboot
$ vim flash-all.sh
#if ! grep -q partition-exists $(which fastboot); then
# echo "fastboot too old; please download the latest version at https://developer.android.com/studio/releases/platform-tools.html"
# exit 1
#fi
P.S. 使用新版platform-tools_r33.0.3-linux.zip並且註解掉檢查即可