How to change I2C speed

[chobio]

Hi scorpiochang,

Thank you for your support.
I using TinkerOS ver.1.8 ,so this is problem for not working ovrerlays.
when using Ver.2.04, it works.
Thank you.

by the way, I looking for the way how to OS upgrade from ver.1.8 to 2.04 without sd image rewrite. (like raspberry pi rpi-update)
if you know the way, i am very happy...