As long as your unit is within the updating period, you still can update it. But it is not suggested customer updating all the software near the overdue, it may cause downloading failed for unexpected sever issues, just in case. So always leave several days to start updating your software.
The latest system version as following:
Android version: V4.0.4
Maxisys Mini MaxiUI: V03.03.00/ Maxisys V3.01
System version: V2.00 (Go to Maxisys->Setting->About to check it)