[knob]

It's risky, I tried with another firmware from a player that looked like mine had the same button layout and the same screen layout, the only difference was it would not load into my version of ConsumerUpdate, so I used another version of ConsumerUpdate to make it load in, this was wrong and I nearly bricked my player, I lost the screen and had to work out how to get to the update menu option "blind". I did find a firmware that worked in the end, with the same layout AND worked and my version of ConsumerUpdate, so its ok now.
The game by the way is not very good it's only tetris, it's seems like the firmware version you have is a better version, it's file size is bigger even without the game. I think you would be better to stick with the version you have for now, and wait for some better tools.
If you really feel you must update your player be prepared that it might be lost forever and only flash a firmware thats from a player that looks like yours, has the same screen and button layout and only use YOUR OWN version of ConsumerUpdate, but it is risky just for a simple game.
By the way I did see if your firmware would load into my consumerUpdate and it did not, and my player looks just like yours, so it isn't easy, what we really need are tools to do a firmware backup to keep safe.