@robert-zaremba You can still use dev with datadir. Dev just uses a 0-period clique chain.
That said, --dev was not meant to be used on custom networks / genesis blocks. If you need a custom setup, you can init a chain of your choosing. Dev will try to be smart and configure a lot of stuff for easy testing, but it's not flexible, it's easy.
翻譯：
--dev不能用在 custom networks 和genesis blocks.
=========== Error understand ============
--dev => 1337
So use --dev must networkid & chainId set 1337