Unable install LEDE in to Buffalo WHR-HP-G300n

Hello i have router Buffalo WHR-HP-G300N v1.2 with Atheros AR7240 in this device is instaled ddwrt i tried install LEDE with this two files https://downloads.lede-project.org/releases/17.01.0-rc2/targets/ar71xx/generic/lede-17.01.0-rc2-r3131-42f3c1f-ar71xx-generic-whr-hp-g300n-squashfs-factory.bin and https://downloads.lede-project.org/releases/17.01.0-rc2/targets/ar71xx/generic/lede-17.01.0-rc2-r3131-42f3c1f-ar71xx-generic-whr-hp-g300n-squashfs-sysupgrade.bin but still no success,because after fw upload into router ddwrt writes that "upgrade success" but still remains ddwrt and no sign of LEDE.How to get ridoff ddwrt?Maybe i wrong doing install order?:confused:

Consult DD-Wrt's documentation on how to revert back to stock firmware. From there, you can flash LEDE.

The sysupgrade images are only meant to be used when upgrading from an existing OpenWrt or LEDE installation.