Linksys E7350 OpenWrt install

Alright so, apparently according to mtd, "s_env" is not the proper partition. How would I list & find the proper partition to be erased? According to the dropdown in "Backup / Flash Firmware" in LUCI, the available partitions a few, but one sticks out "alt_firmware". I would assume it to be "alt_firmware" rather than "s_env".

EDIT: Actually, running mtd gives me the following options:

One thing sticks out: "resetbc ". Maybe we can utilize that command rather than "unlock" & "erase"?

EDIT 2: These are the available MTD devices on the E7350:
image

I would assume that we gotta erase "alt_firmware" here, and not "s_env".