Onda V919 Air Dual OS - Fix it via Sideload only ?

So, as the story goes, I accidently bricked by tabled, by rooting it.

Now all I have is.
- EFI Shell
- EFI OS
- my USB Stick


I managed to boot the stock 4.4.4 firmware downloaded from "" and it flashed it's files (system.img boot.img etc.)
However the tablet still refused to boot.

The only thing I now have left, is the ADB-Sideoad feature (accessible via EFI OS).

Any ideas on how to fix this with just ADB-Sideload ?
(Fastboot won't work, I've tried this numerous times).

Mods:
Feel free to move this thread, as Onda devices have seemingly no subforum on this page.

Thanks in advance:

-Rye-

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