S-V6.8: Faster processing of Serial commands for better guiding
responsiveness. You can use the config utility to fetch the new
firmware.
H-V4.3: Minor PCB rearrangement to make soldering and assembly easier.
Nothing changed electrically.

Patch to cure the RA axis moving at twice as fast as it should when
microstepping is disabled.

The bootloader is required if you are making your own AstroEQ board
using the ATMega162. If you have bought a kit or ready assembled board
from me, this is not needed.