I want to unlock code for lg hr598d

You can consider using your computer to create a region free copy of your Blu-ray/DVD discs if the purpose of you unlocking the region code is to play region-locked Blu-ray/DVDs. Region code unlocking is not feasible for every Blu-ray/DVD playback device. But you can use a program called Leawo Blu-ray Copy to create region free copies of your Blu-ray/DVD discs that you can play on any Blu-ray/DVD playback device. Check out how to use the program to create region free copies in this post: How to Make 1 1 Disc to Disc Blu ray Backup with 1 Click Blu ray Copy...

DVD REGION FREE & BLUE-RAY REGION FREE
To change the Region code on your DVD player, open Control Panel - System - Hardware - Device manager, and click on DVD/CD ROM drives, then right click on the DVD drive and click Properties then click on DVD Region.
You can enter a new region and it also shows you how many changes have been made.
NOTE you can make only 4 changes and the player will lock permanently on the 4th change.
If you want to play DVDs from any region you maybe able to upgrade the firmware to make it region free BUT if you make a mistake or installed the wrong firmware the player will be a piece of junk.
The best solution to make the player region free is to install a piece of software (Passkey for DVD) that allows you to play DVDs from any region and Passkey for Blu-ray that allows you to play Blu-rays from any region. There are several available on the Internet but my favourite is DVD-Region Free From: -
www.dvdfab.com/products,free.htm