Iris 504Q is the best selling smartphone so far from Lava and it should be because of its strong processing powers and HD display with several other features. But its been about three months to the device launched in the market and so far Lava has not provided any official firmware upgrade to the device. While many other brands have already started rolling out Android 4.3 update, Iris 504Q is still stuck with the same Android 4.2. However, earlier this month Lava posted on their facebook page saying they will release an FOTA for Iris 504Q but yet there is no sign for the same. Hence, if you want you can try out installing Custom ROM on your phone to get some change in the UI with few new features.
I’m talking about IrisCanvas4 Custom ROM. As its name suggests, you might have imagine that the ROM is based on Micromax Canvas. Yes, you are right. This Custom ROM brings several features of Canvas 4 to your Iris 504Q such as Blow to Unlock, Panorama from bottom to top, etc. It is a light weight ROM and works fine on Iris 504Q. If you want you can download the same from this page in just one click by hitting the download. If you are not aware of installation method, you can through this guide with step by step method of installing this ROM on your Lava Iris 504Q. 
Download IrisCanvas4 Custom Rom
