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Outside the UK/USA people pronounce acronym EFI (Extensible Firmware Interface) in two different versions: [ɪfɪ] and [ɪ-ef-aɪ].

The first argue their pronunciation that 'I', for example, mean 'Interface' ([ˈɪntəfeɪs]) and should be read as [ɪ]. The second argue that the English letter 'I' is read as [aɪ].

From the point of native English speakers, what variant is more correct?

I hope there are some rules for it and this question is not opinion-based.

Outside the UK/USA people pronounce acronym EFI (Extensible Firmware Interface) in two different versions: [ɪfɪ] and [ɪ-ef-aɪ].

The first argue their pronunciation that 'I', for example, mean 'Interface' ([ˈɪntəfeɪs]) and should be read as [ɪ]. The second argue that the English letter 'I' is read as [aɪ].

From the point of native English speakers, what variant is more correct?

Outside the UK/USA people pronounce acronym EFI (Extensible Firmware Interface) in two different versions: [ɪfɪ] and [ɪ-ef-aɪ].

The first argue their pronunciation that 'I', for example, mean 'Interface' ([ˈɪntəfeɪs]) and should be read as [ɪ]. The second argue that the English letter 'I' is read as [aɪ].

From the point of native English speakers, what variant is more correct?

I hope there are some rules for it and this question is not opinion-based.

1
source | link

Correct pronunciation of EFI

Outside the UK/USA people pronounce acronym EFI (Extensible Firmware Interface) in two different versions: [ɪfɪ] and [ɪ-ef-aɪ].

The first argue their pronunciation that 'I', for example, mean 'Interface' ([ˈɪntəfeɪs]) and should be read as [ɪ]. The second argue that the English letter 'I' is read as [aɪ].

From the point of native English speakers, what variant is more correct?