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I would definitely recommend upgrading to 2.9.0. You will have to upgrade to 2.6.2 first, and then to 2.9.0.HA (you do not have to upgrade AP firmware in this manner though - you can upgrade it straight to 2.9.0). Please see BlueSocket/vWLAN Version 2.9.0.HA Released for more information. 2.9.0 does have a few optimizations for the 1800v2s, but remember being EOL there are hardware limitations in conjunction with new client wireless chips.
Another good idea is to make sure you have smaller coverage cells and a good site channel/power plan so that clients are more evenly distributed. The less clients on the radio, the less strain on your 1800s. You can also use the vWLAN configuration to limit the number of clients per radio as well.
You can use Avoiding RF Interference with a Successful BlueSocket Wireless Deployment for more information on proper channel and power settings.
ADTRAN Product Support Engineer
Thank you. We will try to launch a some location with new software.
I would also suggest you give your local ADTRAN sales rep or partner a call. We have a promo going on where you can trade up to 11ac at significant discounts.