Hello, i encounter the same things AND nothing works.
In fact, after 1 week of trying ALL things to update, (for short saying)
i'm at this point :
"Currently the device hangs at the INFOTMIC screen, and does not continue. Pressing bak+home+power brings me to the restore menu, but then it hangs at 1 second. Pressing within the 5 seonds back+home, it give a message that no recovery is found, try from SD."
In fact, we have to know which keys we have to push to do the upgrade, the tablet REQUIRE the f***ing keys TO if not, he never accept to upgrade...
OR we have to make a bootable SD card who launch the upgrade but i don't know how
If anyone have THE correct solution, is going to be "the king of kings" !
Sorry if i'm rude, but after reading undred post who many people says the same things, i'm a little upset.
No the sd card don't boot by imself, no pressing home+power work, no bootloader on the root of the sd card don't work, etc etc etc ....
For the record, i have a superpad II and with the sameS (i have 3 sd card, silicon power and sandisk) micro sd card, I do the upgrade, but in the superpad III NO.