Well I have the device here now. It doesn't boot past the splash screen.
In the bootloader it says this in the upper left corner:
Code:
Android cardhu-user bootloader <1.00 e> released by "WW_epad-10.6.1.8-20130225" A03
Key driver not found... Booting OS
Starting Fastboot USB download protocol
Whenever I try to go into RCK (with the WW_epad-user-10.6.1.8.zip in the root), it boots into recovery, starts the update, the blue bar fills quickly to full within 1 second and immediately I get the Android on its back with the red exclamation mark.
Any suggestions from here?
---------- Post added at 03:31 PM ---------- Previous post was at 02:40 PM ----------
Well since it said
Code:
Starting fastboot USB download protocol
I just went ahead and extracted the 2nd zip, hooked up the TF300T to my pc and fastboot recognized it

So I issued
Code:
fastboot -i 0x0B05 flash system blob
command. It just sat there, when after a minute or so it prompted me with
Code:
sending "system" <800923kb>...
Now it just hangs there (cursor blinking)
Curious to what's next
>>> wel it's been sending for 20 mins now, nothing much is happening
>>> 2nd attempt succeeded! but resulted in a bootloop again...
trying again...