Hey there is the Official Marshmallow update of INFOCUS M680 Stable release. To avoid Errors flash this using TWRP Recovery. Click here To see complete Guide to flash TWRP in Lollipop. Requirements: Working M680 Error free Lollipop firmware Working TWRP Recovery for Lollipop Update: Click Here To Download A USB Cable A Mind Note: I am not responsible for any Fault of your Device. Step 1: Download the Update File from Above. Step 2: Boot your M680 into Recovery Mode By Using Key Combinations ( i.e., Vol Up + Power Key + Plug in USB Cable) . Step 3: Select Install and find Update.zip and Flash it. Step 4: Wait.... Until it Finished. Step 5: Click on Reboot System Button. Voila You have Flashed Latest version of M680 Stock on Your M680.
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