Wikipedia states the origin of injera is unknown; a folklore account places invention around 100 BC and mitad griddles are known from archaeological sites around 600 AD, but both are described as unconfirmed.
What would resolve this A dated archaeological find of fermented-teff residue or an injera-specific artifact tied stratigraphically to a site, or a written record older than the 19th-century sources currently known, naming injera or its precursor by name.
Openfood history, archaeologyInjera (Wikipedia)