TS-H552U problems detecting dvd writing speed

hay all!
i have a sam TS-H552U DVD burner,
the problem is that it doesnt detect’s the right Writing speed for DVD media
i tried using TEAC DVD-R X8 media and the burner detects the DVD media as X2 for writing. i used Nero Burning Rom 6/7 and CDBurnerXP Pro 3.
i tried upgrading the burner’s Firmware from 06 to 07 (the latest) and nothing seems to work, using NEC DVD burner everyting is great and no problems with the DVD-R media.

what can i do? is there any solution for this problem?

thanx guys.

Use better and supported dvd media, like TY and Verbatim.