Minipro 6.85 2021 Download -

Released in late 2018, version 6.85 is widely regarded as the most stable and compatible version for "Legacy" TL866 hardware.

Generally, no. Firmware downgrades are blocked by the manufacturer to prevent bricking. If you have a TL866II Plus with firmware 4.x, you cannot revert to 3.x required by Minipro 6.85. Check your firmware version first. minipro 6.85 download