HELP! Hitachi GD5000

I have problem with Hitachi GD5000.
I can`t read DVD-R larger capacity of 3,95 GB.
It can read DVD-ROMs (+ and -R) Cap. 4,7 GB without problem.
Does anyone knows how to solve this problem?

I think that problem is in firmwere,beacouse when this GD5000 is made standard for DVD-R was 3,95 GB.
I tried, buy haven`t find firmwere.

Here you go: