My NEC ND-1100a wont burn in 4x

[CuBone]

The nec nd-1100a is suposed to write dvd+r in 4x but mine won't.

In nero the highest speed I can choose is 2.4x
I was thinking it could be the firmware and I found a firmware update on nec's homepage, but to be able to install it the driver had to have Firmwareversion version 1.A0
Nero InfoTool says my firmware is 1.90. How can I install the latest firmware on my drive, or get the driver to burn in 4x?

[-jsl-]

Extract the last 634888 bytes from the flash .exe file (starting at 00090600h) to get the firmware in .bin format, then use TDB's DOS flasher: http://tdb.rpc1.org/

[CuBone]

I dont want to install any third part firmware

[-jsl-]

The firmware will be the same if you extract it from the original .exe but you will have to use a "third part" flash tool.
If you really must use "an official" updater you can try this 1.91 firmware. It's much older and has no support for burning +R with DVD-ROM book type but still newer than the one you have now so if you're lucky it will support your media @4x (what kind of media is it, what's the media code?).