Problem after upgrate to 6.40.4

RouterOS Wireless Networking
1

Hi.
I have two old RB433 stations, connected with RB411. Until yesterday they worked on 5.0rc11. Because I need some snmp features I decided to upgrade to lastest firmware, and when I do this link parameters (with the same settings ) goes worse. Signal parameters is on the same level, but ccq, and tx/rx rate it’s a tragedy. Just look on attached graphs:

Station:
station-txrxrate-day.png
station-txrx-day.png
Client:
client-rate-day.png
client-ccq-day.png
Until yesterday I use nstream, but after upgrade clients goes disconnected every fiev second, so I change nstream to nv2. It helps, but link quality it’s still worse. And when I trying to connect to device it takes a long time.

Any ideas except back to 5.0rc11?

2

And one important information - after upgrade link negotiation takes a lot of time - about 2 minutes. Before it was seconds.

3

Maybe because these are old devices, you should try the latest RouterOS 5 (5.26) also..

Also.. try configuring a fixed rate.