R7800 very slow2.4 after firmware update

Last week I did a firmware update. I can't recall what version it took me to but it wasn't the most recent. Since then I have had issues with wireless especially 2.4. It got to the point that soime devices were not connecting any more. I also noticed there was another firmware update to .78 and I did that but it did not help. When I do a speed test on the device it is consistenly above 470MB. On 2.4 it is 4-15. When I test wired devices it is up to 470. On 5 Mhz its 300-400. I changed setting to channel 11 and dropped it to it to mode 347 Mbps. I also lost access to hard drive connected. I back reved it to .4 and seems a litle better and I can see the hard drive again. I was tyring to back rev to .68 but can't find it anywhere. It is super frustraing because most smart home devices run on 2.4 and that network speed is beyond slow. Any help would be apprecaited. Thanks in advance!!