here is the situation:
My A500 was under ICS 04.03 Thor (I think) It took me over one night and next day the A500 stayed on black screen.
Since, when I turn on my A500 I have a black screen with the power button on and nothing else. I install the official drivers ACER
USB_Acer_1.00.0524_A30H_A31H_A32H_A500_A501 Windows (I tried XP / 7) and then I connect my A500 drivers are installed indicating how ACER RECOVERY BOOT USB
I tried two different USB cables and multiple PCs If I turn my back on A500 and the A500 windows redetects
I feel that there are more OS / BL (I was under ClockworkMod) or Recovery. Finally to get the ACER logo and the inscription at the top of the screen Download mode, I have to use A500APXFlash.exe until reboot the system download mode.
then I'm the ACER logo, but A500APXFLASH stops (see my screenshots).
I tried with EUUs_SBK_Acer_A500_1.016.05_COM_GEN1 (which installs different drivers than those PICASSO ACER RECOVERY BOOT USB) and then it tells me wrong user ID and if I insist a second time it starts updating but stop at 5% about and nothing happens.
I tried USBDeview there is nothing in the same serial number with Afterota, like in the Windows Device UID does not mean anything.
I see u r using this No i need used blackthund3r_A500_APX_Flash_Tool_v0.3-V3BL-CWM u might wanna try v6BL or v7BL apx package
Yr drivers are OK - there are 4 or 5 different drivers needed for the flash but u have the boot/recovery drivers so u should be good
Getting to apx mode is ok
I don't know why the flash will not work as u don't have any of the normal errors showing???
Try with the latest BL version see how u go, if that does not work then a rollback to HC is yr last chance, see jazzyjames tutorial how to do that