I've recently added an additional node to my eap225 outdoor mesh network as the signal between two existing nodes was too weak for a consistent connection. The new ap is getting -55 to -60 to the main ap, and the original node is getting a -60 connection to the new node (vs -69 to -72 recently directly to the main node). 

So... looks like it should work well... but when I try to link the far node to the new intermediate node, it tries to connect... but it looks like the 5ghz is not able to lock in a channel... 157 pops up for a second but then loses it and stays at 0...and then eventually says offline. 

I did notice the new ap is running 1.20 firmware vs my older eap 225s are running 1.5.0 or.1.6.1. I'm assuming (hoping) its a firmware issue but when I try to update the firmware of the older APs, the omada controller (OC200 v1, 1.2.1) says the firmware is up to date. Is there any way I can roll back the firmware on the new AP or upgrade all the other units remotely? (many of the existing APs are in relatively high up and quite frankly will be a huge pain to access and given everything else is working just fine, im hesitant to make changes there if i dont have to)