Replaced writer in dvdrhd04

Hi, new to the forum here!
I just replaced the DDW-451 writer in my ilo dvdrhd04 with a 16X Magicspin DVDRW (iomagic?) externally. I copies from HDD to the DVD ok , but hangsup at 11% during finalizing? What’s up? Do I need a firmware upgrade, or to change the DVD-writer again?
Thanks in advance!
MK