301 chest light level settings

Hello friends. I bought 301 and just joined you. I will have a little question. We can adjust the chest light level. ? Someone on a forum site wrote that the light service was set by holding down the different key combinations after entering the ignition off service standby, but how did I try that hard, I could not. I expect help from friends who know. Thanks in advance. u

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Hello.

I've been using 301 for over 3 years, but I know that only the trip computer's light can be adjusted.