How to change I2c speed

Hi @rudhi.tx,

I have some doubts about dtb.

I create my custom imx6ull-colibri-elsist-slimline.dtb using this command:
make DTC_FLAGS=“-@” imx6ull-colibri-elsist-slimline.dtb
from the dir where I installed the linux kernel (git clone -b v6.1 git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git) like explained here Build Linux Kernel from Source Code | Toradex Developer Center.
The imx6ull-colibri-elsist-slimline.dtb is a copy of imx6ull-colibri-aster.dts placed in arch/arm/boot/dts/ dir where I add:
&i2c1 {r
clock-frequency = <400000>;
};

I load the dtb on Colibri, writing it with:
ubiupdatevol /dev/ubi0_1 ./imx6ull-colibri-elsist-slimline.dtb

I reboot: the monitor doesn’t show nothing but the frequency of /dev/i2c0 was correctly changed to about 400khz.

Where can I find the dtb to use to show the display again ?
Which dts and dti I must use to show the display ?
Where to download the image “Toradex Embedded Linux Reference Multimedia Image (UPSTREAM) 6.2.0+build.6” I flashed with EasyInstaller ?

Thanks