Hi @crispyoz, thanks for helping... I'm trying to build a fresh original u-boot with I2C support enabled. So I need to rebuild official u-boot because I cannot find any evidence of I2C support in Onion bootloader Ralink BootLoader 4.3.0.3 (the same you linked). I found Omega2p dts files in OpenWrt source code: openwrt/target/linux/ramips/dts/OMEGA2.dts openwrt/target/linux/ramips/dts/OMEGA2.dtsi openwrt/target/linux/ramips/dts/OMEGA2P.dts I think one possibility to build the official U-Boot firmware for Omega2p is to create a new board configuration using this two: gardena-smart-gateway-mt7688_defconfig linkit-smart-7688_defconfig Do you think I'm on the right track? Thanks a lot Alex