Unfortunately no, we do not support version downgrades.
When on a programmed ILS approach, the aircraft initially flies in GPS mode, then when inbound to the final approach fix it will switch over to LOC mode and start tracking the localizer. Prior to 1.0.9b, we used to have a condition there that the horizonal deflection (HDEF) of the CDI had to be less than 2.5 dots before automatic LOC tracking on the autopilot would be enabled. That condition was causing trouble, as the G1000 would sometimes switch to LOC mode before less than full CDI needle deflection was detected (happened on very steep turns to final - around 90 degrees). So we got rid of that condition. It's not realistic, but it's the only way to work around this bug in the underlying G1000 simulation.