HTC One Max has a huge 5.9″ Super LCD3 display with a resolution of 1080 x 1920, giving it a pixel density of 373 ppi. Powered by a Qualcomm 1.7GHZ quad-core processor, the device has 2GB RAM, 16 or 32 GB of internal storage and an additional microSD card slot capable of reading up to 64GB. It has the same 4MP camera as the HTC One, which features full 1080p video recording.
CyanogenMod is a huge community of custom ROMs. It has made CM 11 ROMs running on Android KitKat for a large number of devices. Luckily, One Max is among one of them. Follow the guide below to install CM 11 ROM on One Max.