How to delete update notice from Line app?

The problem is that I use Line app on my old iPhone 3g 4.2.1. Approximately 2 month ago Line started to work just on ios 4.3. But I found solution: when I open the app there show me notice that I must update (buy new iBrick) Line, after I go to "settings" of iPhone and turn on "Airplane mode", further I go to Line and there show me that "no net connection", I press "Ok", then turn off "Airplane mode" and again go to Line. After that LIne works until I go to another app or close Line.

Maybe existing other exit?
Cuz I get tired of this routine turn on/turn off airplane mode.

Rewttye

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