Many users report that the firmware (another WM8850 device) works perfectly on the EKEN W70.
If your W70 still boots but has issues, consider instead of flashing. eken+w70+v20+wm8850+firmware+link
the firmware package. You must have the FirmwareInstall directory and the wmt_scriptcmd file in the root of the SD card. Many users report that the firmware (another WM8850
25 Nov 2012 — i managed to get my tablet WM8850-MID(MID7_8233_FT5306_bsr025v0) to update to 1.5. 0 by downloading "W70-1.5. 1680-WIN8-1108. zip" Android Tablet Forum · knuxyl WM8850-MID Tablet Firmware Files and Root Instructions You must have the FirmwareInstall directory and the
If you are looking for a "paper" (datasheet or schematic) for the WM8850, these were generally not public. However, the can sometimes be found on embedded developer forums. It covers:
Once the screen says "Please remove SD Card," pull the card out. The tablet will reboot into the fresh OS. Troubleshooting Tips