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LPH7366 (nokia 3110/5110) contrast command wont work

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tarts

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Does anyone know why I cant change contrast on 5110 LCD?. When I send the command (0x80 to 0xff) to one of my 3310 LCD-s to change Vop, the contrast changes like it should. But I recently bought a bunch of 5110 LCD-s(which I think are refurbished cause they look used) and this command doesn't work. Contrast can't be changed. Does anyone know the reason?

Heres the link to driver that should be in 3310/5110 LCD **broken link removed**
 

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