Reporte, a menos que o despiste esteja completo.

Here reporte is a command: the formal singular imperative of reportar.

In other words, it is the form you would use when addressing:

• você
• o senhor
• a senhora

So it is like saying Report.

For comparison:

• tu → reporta
• você / o senhor / a senhora → reporte
• vocês → reportem

In European Portuguese, the subject is usually left out in commands, so the sentence does not need to say Você reporte.

It is possible and understandable, but in European Portuguese it can sometimes sound formal, technical, or influenced by English, depending on the context.

Very often, European Portuguese prefers other verbs such as:

• informar
• comunicar
• relatar
• denunciar

So reporte is grammatically fine, but whether it sounds fully natural depends on the situation and the kind of reporting meant.

Because a menos que normally requires the subjunctive.

So:

• está = indicative
• esteja = subjunctive

After a menos que (unless), standard Portuguese uses the subjunctive because the clause expresses a condition or exception, not a simple statement of fact.

So:

• a menos que o despiste esteja completo = correct
• a menos que o despiste está completo = not standard

A menos que means unless or except if.

It introduces an exception:

• Do X, unless Y

It is perfectly correct and common. Another very common alternative is:

• a não ser que

So these are often close in meaning:

• Reporte, a menos que...
• Reporte, a não ser que...

Both are natural.

Because despiste is a masculine singular noun, and Portuguese often uses the definite article where English would not.

So:

• o despiste = the despiste

Even when English might prefer no article, Portuguese often includes one if the speaker is referring to something specific or already understood from the context.

Because completo is an adjective agreeing with despiste, which is:

• masculine
• singular

So the adjective must also be:

• masculine
• singular

That gives:

• o despiste completo

Not:

• completa → feminine
• completamente → adverb, meaning completely

Here the sentence is describing the state of the noun, so an adjective is needed.

Because completo is the normal adjective for describing a finished/whole/complete state.

With estar + adjective, Portuguese often describes a condition or result:

• está pronto
• está aberto
• está completo

Completado is possible in some contexts, but it sounds more like a past participle focused on the action of completing. In many cases, completo is the more natural choice.

Because Portuguese normally leaves out the subject in commands when it is clear from the verb form.

So instead of saying:

• Você reporte

Portuguese normally just says:

• Reporte

That is especially normal in instructions, warnings, and formal directives.

Yes. That is also correct.

These two versions are both possible:

• Reporte, a menos que o despiste esteja completo.
• A menos que o despiste esteja completo, reporte.

The difference is mostly about emphasis:

• starting with Reporte makes the command come first
• starting with A menos que... highlights the condition first

Yes, possibly.

Portuguese, like English, can omit the object when it is already clear from context. So reporte may mean:

• report it
• report the incident
• report the case
• report this

If needed, the sentence could be more explicit:

• Reporte isso
• Reporte o caso
• Reporte o incidente

Yes. The form reporte can also be the present subjunctive of reportar.

That happens because, for many verbs, the formal imperative and the present subjunctive have the same form.

But in this sentence, it is understood as an imperative because it stands as the main clause and gives an instruction:

• Reporte, ... = Report, ...