OpenWrt >> OEM

Hello, im want to go back to OEM on my wrt3200acm the 2 partitions i have 2 david502c builds.

I only need to do this:

LuCI

System → Backup/Flash Firmware → Flash New Firmware Image → Choose File
Select Linksys image [*.img] (Linksys OEM Builds)
Untick Keep Settings, then select Flash Image