pioneer a05

[OURKID]

I have a pioneer ao5/105 in my medion system (Purchased from aldi) and on some discs it will only write a 1x no matter what the write speed of the disc....datasafe 2x media in perticular.
I have looked at updating the firmware but the pioneer website issues a caution warning with the 1.33 update that the aldi/medion system if the update is used the firmware cannot be refreshed to the previous firware if there is any problems.
I was wondering if any of you peeps had come across this situation and would be thankful for your advice.