You are not doing anything wrong. Behavior shown in the video created by you, is the accurate behavior and perfect way of elevating SXT Lite5. The IP address 192.168.0.100 is being assigned to SXT only at the bootup. Meaning -
192.168.0.100 was assigned to SXT via DHCP server. Also DHCP server tells SXT the name of te boot file - "SXTLITE5-Elevate.bin". SXT (at 192.168.0.100 IP address) receives this file (SXTLITE5-Elevate.bin) from your PC, flashes the firmware and reboots at 192.168.0.2. So, 192.168.0.100 was assigned to SXT only in order to send the elevate firmware. Once firmware transferred and SXT boots up with elevate firmware, 192.168.0.100 address no more exists and elevated SXT gets the 192.168.0.2 IP address.
Currently, we only support this method to elevate Mikrrotik SXT Lite5. Hence, you are going to have to configure other network parameters manually, according to your network requirements. Thank you.
Can you make sure of following? - DHCP server needs to run on the Wireless side of the SM. (Typical topology: SM --wireless-- AP----DHCP server). If your DHCP server lies behind the SM (on the ethernet side of the SM), SM can not get IP configuration via DHCP server that lies on the ethernet side of the SM. Thanks.