Kobo Arc Startup Screen & Brightness

Hello.

I use the kobo arc hd at night for reading comics and books.

The brightness was killing me even at the lowest, so im using an android app (nocturno) to add some filter and reduce the brightness.

I have two questions:

1- When turning on the device, the startup screen in white with the kobo logo is at the default brightness, so is extremely unconfortable for me, is there any way to modify that? to put a black screen there? to change it in some way?

2- Is there some contrast app for Kobo, so in order to customize better the brightness you can customize the contrast too?

I wrote kobo but got no reply from them (yet).

Thanks a lot for reading and for any help or comments. Regards.