I don't think so as there're natively Landscape apps using low resolution (that is, 220*176).
However, if you use an app with built-in Landscape mode (for example, PocketHobbitSP2003), it MIGHT work full screen on the BlackJack after the hack, unlike before it. I can't test this as I have no BlackJack.
It won't help with natively Portrait 176*220 apps, I'm sure.
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