OPPO Find 5 X909 - yes, that was the first 1080p smartphone ever made and has a great dev support and many custom roms available on the Oppo forums and xdadevelopers. My unit is bone stock, never been modified and just recently factory reset so it's ready to roll. Full working order and unlocked to all networks.

The phone just went through some proper refurbishing - new LCD/digitizer, new battery and new back cover, new tempered glass screen protector applied, new charger, new cable, new transparent case and all that comes in a OnePlus box. On the last photo you can see the old back cover and battery just for reference but if you want the dark blue original back cover I'll include it free of charge, just let me know. It's currently a collectors phone being the only 1 on eBay so don't miss your chance and press that Buy It Now button before somebody else does.