I have tried in the past to do this with 3.5.XX series firmware with no luck so I would say no. I did however receive an updated from a seller for a player I had that upgraded it from a 9.0.43 with 1 game (tetris) to a 9.0.50 with 4 games (tetris, snake, boxman and Hua Rong Dao a Chinese puzzle game) as well as fixing a text reader bug but there were no compatibility concerns as it was a specific update for the player.
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