Trouble Flashing MR16

Recently i purchased a couple of decomissioned meraki mr16's with the intention of cloud managing them via Cucumber Tony. However, i realised the free version of CT only allows a single AP to be commissioned when i tried to add the second one. So to make them useable i would like to flash openwrt on both units. I'm very much out of my depth when it comes to flashing hardware so i would be very appreciative of someone briefly explaining how to at least start the process.

I am using an arduino to communicate via serial using Putty on windows. Obviously i'm trying to follow the MR16 guide but i'm not really sure what to do. I have got as far as establishing a serial connection and watching it boot. But i have no idea where to go from here!

Any help would be welcomed.

Does this help?

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