I just had newegg send a 3520a, i flashed it with:
LD3520 1.U6 (Beta 6) (Liggy & Dee NEC ND-3520A firmware)
first burn nero would not allow anything more then 4x burn with it, i went to dvd decryptor & while it offered full range of speed i set it to burn at 6x, it would only burn at 4x with media i been burning for months at 8x in the 2500a? what a POS i paid more money to burn at slower speeds? or is there a diff firmeware i need to resolve this issue?

Whats the MID of this media?
Then maybe we can help.

The TechGEEK.com is what the case says, burns fine at 8x on the 2500 that had been firmware upgraded, never had one bad burn at 8x with these so it would seem the media should be fine in this newer nec to at least 8x

Pre-recorded Information:
Manufacturer ID: VDSPMSAB 01
Physical Format Information (Last Recorded):
Book Type: DVD-R

Media Information
Region information N/A not a DVD-VIDEO
Media code/Manufacturer ID VDSPMSAB 01
Format Capacity Not Formatted
Free Blocks 412352512
Free Capacity 4.38GB(4.71GB)
Book Type DVD-R
Media Type DVD-R
Media Id Code Speed 4.0x 5540KBps
Available Write Descriptor CLV 4.0x 5540KBps
Write Strategy Speed 4.0x 5540KBps
2x Speed OPC beta 0B
2x Speed OPC power 10
2x Write Strategy field 1 11 87 78 80
2x Write Strategy field 2 88 80 00 00 00 00
4x Speed OPC beta 06
4x Speed OPC power 17
4x Write Strategy field 1 0D 10 0A 0B
4x Write Strategy field 2 98 08 0F 0B
4x Write Strategy field 3 00 00 00 00
4x Speed OPC beta multi-pulse 06
4x Speed OPC power multi-pulse 1C
4x Write Strategy field 4 13 A8 88 65
4x Write Strategy field 5 98 9A 88 80 00 00
4x Write Strategy field 6 00 00 D0 00 00
Data area starting sector 30000h
Linear Density 0.267um/bit
Track Density 0.74um/track
Number of Layers 1

They can probably be speeded to 8X in the next beta.

Thank you for such quick replies, i just updated to:

LD3520 1.U7 (Beta 7) (Liggy & Dee NEC ND-3520A firmware)

while it seems to work fine, im still at the 4x limit, so i will keep watching for newer versions