LEDE on asus rt-n13 ub1

I have already checked that the LEDE firmware exists but I wanted to get input from actual users if it is stable. It has 8 MB flash but I am assuming that extroot on USB drive can be added.

The device is running dd-wrt. How I do flash the LEDE firmware? One option is recovery mode and TFTP as described for initial flashing on openwrt site, but can I do it from DD-WRT interface?