No matter how long I hold down the reset button, the router will not enter rescue mode. I believe default values in nvram are not set correctly, or the cfe is partially corrupted. I'm trying to flash from dd-wrt to Merlin or the stock firmware to see if that can fix issues I'm receiving with lan and wan. (can still access the router through the 5ghz radios) How may I go about flashing those firmwares safely without entering rescue mode?