Can't boot properly

[Guzbod]

I upgraded Busybox on my Zenithink ZT 180.2 and I think I put it in the wrong folder! Now when I boot up I get a black screen with the icons on the top but I can't access anything. I have tried to flash a new rom but with no success. I Have the ROM on a SD card and a USB flash disk with all the files in the root. When I try to flash the ROM I turn the tablet on with the Power button and the reset button pressed to gether. I have done this instantaneously, and for all of the boot time but with no success. Can anyone tell me what I am doing wrong please?
I started all this cos I got an acore error all the time after I had updated my wall paper!!

 

[Guzbod]

I need to do a hard reset but no idea how to do this. If I press the back button and power button it boots as normal, if Ipress menu and power it resets but Gives me a black screen with just the top menu bar and I can't do anything. ANYONE got any ideas please?

 

[Herkfrog]

first off push the power button and then as it is starting to boot push the rocker switch button closer to the power button ( the rocker switch looks like it should be a volume up down switch) not the reset button and then it should go and start looking for your update files also reading this might help Link ( PLEASE READ Before asking questions about Firmware Upgrades (Flashing roms) - SlateDroid.com ) there a lot of versions of the zt-180's and each needs it' own rom (firmware) update