There is no need for custom recovery... Use the Flash Gordon app from play store. All you need is root and busybox. You can flash zips but not ROMS..

Sent from my LG-D802 using xda app-developers app
New Phone: 16GB LG G2 D802
Past Phones: Nokia 6600 Slide, 16GB iPhone 4 Black, 16GB Pearl Blue Samsung Galaxy S3 lag edition, 16 GB Black Xperia Z1 C6903