Hi all. I have a ZT 280 C91 (not Upgrade) and the screen resolution seems to have deteriorated. Before the colours were bright and quite sharp but now it is pale and the "blacks" are not black but grey. Adjusting the display brightness does not solve the problem (only makes the screen brighter). It is very frustrating as in some apps colours are barely visible and as I said it looks "washed out". Any ideas?