Insert your SD card into your computer via a cardreader.
Open MiniToolPartitionWizard. Format your sdcard in ext2, remember to use only the primarypartition.
Open Ext2Fsdmount the ext2 partition on your Windows and move the file update.zip
Now on your Phone enable USBDebugging
After enabling, connect your device to your computer, and you’ll see a warning, give permission. Extract the ADB and FastbootMinimal to a folder, click on it with the rightmouse button with the down shift and click Open commandwindowhere.
Now Type the below commands.
adbshell rebootrecovery
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lets’ install update.zip.
In recovery select “applyupdate from external sd card” and select the update.zip
click Reboot system now the device will reboot
Now You Have RootPermission On Your LG L90 D405……………..