Trouble with writing speed

Do you know how can I set writing speed to 2,4x instead of 4x in Nero ? It was inactive in 4x(5.540KB/s) I could not choose another writing speed (2,4x).

When I burned DVDs with 2,4x speed I can play them always in DVD-player, not with 4x speed.

My DVD burner is LITE-ON DVDRW SOHW-1213S

I tried to burn with DVD Decrypter, I set 2x speed but they set automatical to 4x

W 14:25:07 [1:0:0] LITE-ON DVDRW SOHW-1213S TS08 (I:) (ATA) - Selected Write Speed: 2.770 KB/s (2x)
W 14:25:07 [1:0:0] LITE-ON DVDRW SOHW-1213S TS08 (I:) (ATA) - Actual Write Speed: 5.540 KB/s (4x)

Do you know another DVD-burner software that I can set writing speed ?

my experience is that nero will always offer a range of burning speeds if it possibly can. therefore i suggest your issue may be related to the brand of DVD you are using and/or you possibly might benefit from updated firmware for the DvD burner.