Better go for Nokia 2112. I am mobile technician and prefer to use this if battery is preference. It would work fine with network, battery, sound and everything you need. But once got any hardware problem, very difficult to repair. Problem mostly comes in Flash IC.
Otherwise go for Classic...
This isn't a software problem. Better go to service center as your handset is still in warranty. Flashing won't solve this as problem is in LCD. But be careful because they will try to misguide you by sying that you have done this or something like that.
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