If you mean about that such firmware exist then, nobody told me, I just asked does it exist and if yes, where can I find it.
If you reffer to read speed of original CD's then, I read that on www.benchmark.co.yu (exact link: http://www.benchmark.co.yu/vidito.php?oliver=1429&sid=4687&pop=DoP&form22=+Idi%21+ ), my country's IT site, but for model 8525B, i think it's same for my model
btw. Nero Info Tool reports 52x read speed when there's no CD in drive, and 40x when I insert any CD. Also, when I try copying 700MB file from CD in Total Commander, maximum read speed is 6230KB/s, while for 52x is declared 9152KB/s.