Problems Re-Flashing ATtiny85 After Setting prescale to 0x00
There are several issues with the avrdude command you posted.


You are specifying a baud rate and a serial port with -P COM3  -b 19200, which is nonsensical as the USBasp is a pure usb peripheral and does not require a serial port nor use a usb to serial converter internally. These settings have no effect.
You have selected the Atmel avrisp as your programmer with -c avrisp, while you claim that your programmer is the USBasp. This may or may not work, but avrdude supports USBasp natively, so you should instruct avrdude that the programmer is USBasp with -c usbasp.
You are rewriting the efuse bits without specifying a value with -U efuse:w::m. The correct way to set the fuse bits in immediate mode (not reading the fuse bit values from a file) would be -U FUSE:w:VALUE:m, for example -U efuse:w:0xFF:m. The manual of avrdude does not state that leaving the fuse value unspecified sets the fuse to its default value, so it probably just sets the fuse to 0x00.
Your programmer is not the Atmel JTAG ICE, so the bit clock setting -B700 is nonsensical, and has no effect.


The good news is that you trashed efuse instead of hfuse, which could have bricked the AVR by setting RSTDISBL and thus preventing reprogramming.

To resurrect your chip, I would suggest to reprogram all fuses. My guess is that you have inadvertently messed up the fuse values at some point, causing the chip to run at 1MHz or less. This causes the programmer to communicate too fast relative to the clock frequency of the ATtiny, resulting in the glitched transaction you see. The USBasp has a jumper for lowering the data rate, which you should set. For the fuses themselves, there is a handy online tool for easily determining and understanding the values. To program the fuses, run

avrdude -p t85 -c usbasp -P usb -U lfuse:w:0x62:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m


(8MHz clock frequency using internal oscillator, isp enabled, no special settings)

For flashing the chip with a new .hex, run

avrdude -p t85 -c usbasb -P usb -U flash:w:FILENAME:i