The string airap2800k9me851820tar refers to the , specifically pointing toward the MEA (Middle East & Africa) regulatory domain and a specific firmware revision (likely version 8.5.182.0).
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A standout feature of the 2800 series is its technology. The access point contains a dedicated 5-GHz radio and a "flexible" radio that, by default, serves 2.4 GHz clients but can be dynamically reassigned.