Okay.
I decided to update the firmware again! This time, it went through in less than 2 minutes. Everything is working as expected too. Last time, it didn't go through fully. Anyway, the firmware is at the latest version now.
Still, I experience some issues now and then. For example, whenever I get alert/s about some movement of objects, the corresponding video clip doesn't load. I have to use the playback features and find the right time to see the actual clip. 🤢