I've also tried to power it off then press Volume + then plugged it. (SD card removed, battery cannot remove because it's soldered) It detects as MTK USB Port but it never detects as MTK 65xx Preloader as to what I've searched.
I am so frustrated and I really really want to connect this to my pc so I can start flashing on it.
I hope you can help me with this guys.
CPU: ARM Cortex-A9
RAM: 233 MB
Android Version: 4.1.2 (but I can tell it's Gingerbread)
Kernel Arch: armv71
Kernel Version: 18.104.22.168