Firmware 4.1 was the 1st software to support the new 2021 models (both the TH and SMD versions). If you have one of these units I suggest that you update the firmware to the latest version (4.4 at the time I write this).
There are 2 problems that could arise and I give here some tips to overcome them:
- the most serious problem is that the 12345678 password is not be accepted. It happened in a couple of units. This means that you can not operate the multiplexer. The only way to solve this problem is to return the multiplexer to me or do a ERASE and REFLASH as explained here. That completes solves the problem and you will get the most recent firmware.