If you must proceed, find your exact model number (e.g., 100005206 or 100011885 ) printed on the back of the tablet or on the box, then cross-reference it on Needrom.com . Do not download generic "ONN Driver Installers" from random sites.
Since Onn tablets typically use or Rockchip processors, you will likely need specific utility software to install the firmware: onn tablet firmware download
: Go to Settings > About Tablet and note your "Build Number." Firmware is version-specific; installing the wrong "flavor" can lead to a "brick" (a non-functional device). If you must proceed, find your exact model number (e