I've recently set up a home network for a relative using a SG2016P v1.20 switch with a self-hosted Omada controller over HTTPS.
No matter how many times I try, either using cloud update(Omada controller/Internet update), or local via Wi-Fi/Ethernet, the device always refuses to update the firmware version, it looks like it upgraded successfully but after rebooting the firmware version remains the same.

The installed firmware is 1.20.5 and the device prompts me to update to 1.20.19