The MR53 and MR56 do not support the 6Ghz...see the datasheet. https://meraki.cisco.com/lib/pdf/meraki_datasheet_MR53.pdf https://documentation.meraki.com/MR/MR_Overview_and_Specifications/MR56_Datasheet MR57 and the new AP's CW9172H, CW9172I, CW9176I, CW9178I, CW9176D1 will support it. But can not tell you about any restriction on Vietnam.
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