HTC Desire 620G Dual Sim

I recently came into the possession of a HTC Desire 620G Dual Sim (it was my father's) Android 4.4.2, Kernel 3.4.67, Chipset Mediatek MT6592 (Online is liste as android 4.4.4 but that is a lie). After days of searching the web and reading countless forums I came to the conclusion that this is a very unpopular and abandoned smartphone. I really want to change the android version on this phone, I know how to root, I learned from this forums. The only problem I have is that I can't find any android versions ported for this phone, I need anything newer than 4.4.2, I would like 4.4.4 or lollipop as i heard it runs better. I checked all custom androids none has support for this device, I cant even find this phone on the clockworkmod and TWRP list of devices. What do I do now? If I can't even install a custom recovery on this phone? So to sum this up, I need a custom recovery mode for this phone and a ported android version newer than 4.4.2. I would appreciate any help.