LHG 5ac wireless problem

I have upgraded a 10km link from lhg5 to lhg5ac as the customer requires more bandwidth. the problem is that when I configure the link to use a/n/ac OR n/ac OR only ac mode the link stucks in legacy rf mode(54mbps) i.e, no mcs mode.
But in normal a/n mode, it works fine. any suggestions or help is welcome. thanx in advance
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Try newest Firmware for ARM devices
check allignment, is the line of sight free?
With this output power, you must get better rates.
If not try to lower output power

it is the newest long term firmware. please refer to the image.
the problem is that it is not shifting to mcs rates at all

any solution?
normis?

Can you please share your config (and remove any non relevant information):

/interface wireless export hide-sensitive

Why are you using superchannel?
What kind of security settings are you using?

Im sharing the pics. Tried everything but of no use. Im using the mikrotik sector (mAntBox 19s) at same location in a/n/ac mode and it is working fine.
Is it possible that the Lhg itself is faulty?
Using superchannel bcoz its takes a lot of time in radar detect


Couple of things:

  • You can copy from the terminal, no need to take screenshots…
  • Antenna gain can (should?) be set to 19
  • Only use WPA2/AES (and nothing else)

You know that you are currently not compliant to regulations?

Thanx for reply
Tried the settings suggested by you but its the same result.
as far as compliance is concerned, trying these settings on temporary basis to check if the link works

Try 6.47.1, there are some ARM fixes missing in this old Long term