The recent android 6.0 Marshmallow update (March, 2016) for the Infinix Hot 2 x510 that can be downloaded from here and use to upgrade your Infinix Hot 2 X510 to the latest android 6.0 Marshmallow has just been tested and confirmed working perfect.
Considering the experience with this update, this update fixes a number of bugs in the January 2016, February 2016 and 0202 test builds Marshmallow for the same device, Infinix Hot 2 x510.
How to Upgrade Infinix Hot 2 to the Android 6 Marshmallow (1, March 2016 Update) Using SP flash tool
1. Download the Stock ROM for Infinix X510-D5110-M-Androidone-20160315 from the download section below here.
2. Downlad and Install USB VCOM drivers on your PC. See the guides here: How to Install Complete VCom Drivers for MTK Android
3. Flash the ROMDump to the Infinix Hot 2 X510 using SP flash tool. See the guides here: How to Flash Stock ROM On Infinix Android
4. Boot up the phone once flashing is complete.
If the phone gets stuck at boot animation, take out the battery and slot it back in then leave the phone to boot up normally.
Note: If you encounter this error;
NVRAM Warning Err = 0x10
Following the flashing operation, then fix it using the exclusive guides here: Solution for NVRAM WARNING err 0x10 On All MTK Androids