Worked really great with cubed!
For those who get error 12, Windows thinks it has the correct drivers installed when it doesn't. So plug in, let windows try to install drivers successfully. When Windows finishes, open the zadig.exe and itt'l prolly show blank, click options, then "list all devices" and in the list find something like "Modem", select that, re install drivers.
Turn off the tab if already in download mode by holding power. GO back in download mode by volume down and power (It might show a new icon instead of downloading, means the error soft bricked the tab, but doesn't matter, continue like normal) and plug in and retry!
If you need help feel free to PM me!