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Hi guys ! I have a problem, 4 buttons of my Challenger Ultimate keyboard are not working: F12, PrtScn, ScrLK, Pause :/ These buttons are located close to each other and have never experienced any liquid / chemical / physical harmful influence. What I have tried: 1. Removed the buttons and tried carefully pressing their membranes 2. Manually disassembled a keyboard and checked that two films with electrical lines and contacts - are correctly located 3. Reset all the keyboard internal profiles Unfortunately, these steps were not enough to fix these buttons (meanwhile, all t