After spending a month with this router and was able to gather enough information from the Linksys Firmware log as well as discussions on openwrt to build Lede for this router.
Few key observations:
- It uses dual trx images for failsafe purpose
- Broadcom 4366c0 wireless chip is used and it's firmware is missing. Although it can be extracted from dhd.ko
- CPU port is 5 just like Netgear R8000. Which needs changes to b53_common.c and 02_Network
I've documented the investigation here: https://serialize.wordpress.com/
Any suggestions welcome.