From your video I can clearly see that your machine is kept at a lower pressure than mine. Looking at your manometer, I can see that before you start your first shot you are below 0.5 bar. You then get a boost, but even at the peak you are lower than 1.5 bar, and as soon as you start steaming you go down to 1 bar or less. No wonder you are getting weak steaming performance.
Compare this to my machine in the video below. In this video pressure before the shot is ~1 bar. This is higher than normal, because I didn’t let the machine settle completely from cold. The machine is usually ~0.5 bar before I start a shot. More importantly, look what happens on the manometer after the shot. Steam boost brings it to around 1.5 bar, and it stays there during steaming, giving a much better performance than what you get at 1 bar and below.
I very much doubt the cause for this would be the change of settings in the firmware. We have seen people with this issue. As I said in the first post, I put my money on the issue being caused by a temp sensor (but I have not had it myself, so can’t tell you from my own experience).
P.S. What water are you using in the machine? Could it be that you water is hard and you have scale on the temp sensor? Also, what is your brew temp switch set to (the one with zero, one and two behind the drip tray)? I see you have a thermometer on the group - do the readings you get from it correspond correctly to the temp setting you have selected?
The Gicar can also be the problem, but as you have access to the readings you can check if they are faulty. DavecUK is better placed to tell you what you need to look for in the settings.
Here is a video from mine for comparison: