@mitu ok but yes, i tried different roms and the bios is there and correct, validatd the hash. it is getting recognized by mGBA too. i thought maybe it's related so i answered in this thread. It really seems like a BIOS problem though because at first start there is no gba intro only after the restart and the following restarts the intro appears, really weird problem. Are there other known gba roms with skip-intro problems maybe so i could test those?
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first