Teclast has released the dual OS bios for the X98 Pro. This came out on the Teclast forum, unexpected since it is their national day in China today. I’ve yet to try this myself as my X98 Pro is out of battery. While it charges up to a safe 50% I’ll flash the new bios and try again to Flash Android 5 and later Windows 10 with the WINRE image.
I’ll get some details up soon with a how to, in the meantime a few forum members in this X98 Pro thread here have flashed it and got Android working. Files are in the thread for now while I get some mirrors up.
More and dual boot bios, Android rom downloads here: http://techtablets.com/forums/topic/x98-pro-dual-os-firmware/#post-12352
Edit: I’ve managed to flash this myself and I’m working on a guide on how to move the X98 Pro over to a dual boot machine. I’ve flashed the Android 5.1 Rom and my AnTutu scores are 51k. But my unit has a copper heat sink mod, so I cheated.
Thanks to Robert for his help restoring my semi bricked X98 Pro and hard work on this!