Gaming DSi Volume/Brightness Issue

[expx]

Hello everyone, i got pair of Nintendo DSi handhelds. Weird issue with one of those is even though volume buttons work and volume icon is changing, actual volume is always set to single value and is never changing. This applies to brightness as well. Initially console was running 1.4.3 firmware and i managed to upgrade it to 1.4.5 but no changes. I also did Unlaunched + Twilight Menu + Hiya just to see what is going to happen and all games are running but in regards to issue i have that also didn't help.

Here is video of issue:

Any ideas?

 

[Nikokaro]

Try reading the posts at the bottom of the thread "DSi screen fades/flickers - What does it mean?" maybe you can solve the brightness issue.
It's just a suggestion, maybe it has nothing to do with it.