Antenna Gain 6.47.x Winbox error

how can I adjust the gain of anrtena in routerOS 6.47.x? Winbox
regulatory domain error
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http://forum.mikrotik.com/t/cap-ac-with-ros-6-47-3-country-setting-impossible/142753/1

Use forum search.
At least another two similar topics were created for the last week.

hAp ac Lite, fixed antenna = fixed antenna gain.
Current value is lower (probably 0) because of setting in an earlier release or because of restore/import of another config.

Press “Reset Configuration” on the right for this interface. Loose all interface settings of this interface, but also the obstructing “antenna gain”.value.
(Cutting out the set antenna gain only, can only be done in CLI. )