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Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online services
The guide mentions fastboot flash init_boot <init_boot>.img but there’s no init_boot in the zip. All other files are there.
Often you can borrow the “exact equivalent” .img from a LineageOS build of the same Android version or it can be extracted from the main ROM as [Walkthrough] Extract eRecovery and boot images using payload-dumper-go.
It worked fine without it.