The Stock Android 6.0 M KDZ firmware for LG Magna is also availble for download.
Here you are the stock kdz firmware V20a for H502Y Hungary:
Country: HungaryTo download the stock Android 6.0 M kdz firmware for your LG Magna, Just visit www.lg-firmware-rom.com, input your IMEI, and click download to grab the latest firmware download link.
To UPgrade/Unbrick/Restore yor LG Magna, You may need LG UP Software and Proper DLL files. We will share with you a guide later.