Revive 4MB Flash(/32MB Mem) Devices with RAM overlay root

my method can be found at

then feel free to opkg update & install every remaining things on /etc/rc.local, as long as you have working network, and RAM is enough.
/etc/init.d is also stored in RAM, it wont survive reboot.

converting eth0 to dhcp client:

uci set network.lan.device=eth0
uci set network.lan.proto=dhcp
uci set dhcp.lan=dhcp
uci set dhcp.lan.ignore=1
uci set dhcp.lan.dhcpv4=disabled
uci set dhcp.lan.dhcpv6=disabled
uci set dhcp.lan.ra=disabled
uci set dhcp.lan.ndp=disabled