Many thanks to BLKT, the flashing has worked but the front panel LEDs ain't half weird.
I know this is a'cosmetic' problem but just want to make sure this is 'normal'.
POWER led ON solid green
Both WiFi LEDS flash green intermittently
LED that looks like Saturn lit orange continually (I haven't connected to internet yet)
LAN 3 & 4 LEDs illuminate green permanently without devices connected
LAN 1 & 2 LEDs illuminate green when there's a LAN cable connected to a device
I'll now change the username and password as per instructions and go from there.
I now have another query but not sure where to post so please advise if I need to post this elsewhere.
I'm having great difficulty setting up the router for wireless bridge mode. Before changing to DD-WRT there was a facility to scan all local wireless routers and connect with auto configuration for the required settings - I can't find a similar facility here. I tried following instructions on your wiki and youtube video but it seems dated as from 2013 and one of the settings is to assign 'WAN port to switch' but in the latest FW version this option seems absent unless its been moved somewhere else.
I'm trying to use my mobile phone as the main router connecting to the internet. Gateway is 192.168.147.254 with DNS1 the same address. I need to use the A7 as a secondary router, setting this up to use with a VPN service, IPVanish and route all connections through this so any additional help to do this as well would be greatly appreciated.