Eken+w70+v20+wm8850+firmware+link Verified Online
The device is often rooted by default in some firmware versions, or tools like RootBurner can be used.
Because the W70 and V20 are reference designs, you can sometimes use a generic WM8850 firmware from a different brand (e.g., Ployer MOMO or Chuwi V7). Search for: generic_wm8850_800x480_4gb_20131120.img eken+w70+v20+wm8850+firmware+link
If you still want to attempt recovery, I can give you from a working W70 (using dd or ADB) before trying anything risky. The device is often rooted by default in
He slammed his fist on the desk. The archive had captured the page, but not the file. The link was a husk, a signpost pointing to a demolished building. eken+w70+v20+wm8850+firmware+link
The primary stock firmware for this series is typically labeled as W70-1.1.0-2012-08-15 Official/Mirror Source: