My firmware issue is not the same as the one discussed here. Mine has something to do with the SD card not being read correctly. But this issue has brought to my attention a possible disparity in firmware versions. Maybe this information is in some way germane to this thread.
The first i3 Mega was purchased through Banggood and does not have this problem. Firmware information: v1.4ORC23/P3 /UI:VO.1
The second i3 Mega was purchased through the Official Anycubic store on eBay and does have this problem: Firmware information V1.1.0.