: After a successful flash, delete the installation files from your SD card; otherwise, the tablet will try to re-install the firmware every time it reboots.

The most commonly referenced, working, and rooted firmware for Eken WM8850 MID tablets is available via a detailed guide by CNX Software File Needed:

Copy the FirmwareInstall folder and the wmt_scriptcmd file to the root of your SD card.

Power on the device. It should automatically detect the files and display a progress bar.