Yesterday, I was exploring my phone's system files and I accidentally renamed apk file of launcher when I was exploring /system/app folder. It renamed to "Launcher2.ap" but I absolutely know it's original name is "Launcher2.apk", so I noticed that and I renamed it back to "Launcher2.apk" and it was running normally. But today, I can't get any screen after boot (but it's booted normally) and there is no notification bar, no back/home/menu buttons and no errors have shown. I googled all solutions for this malfunction (including this website) and every solution says "you can fix this via adb" but I can't open USB debugging mode, because of blank screen. I also tried "wipe all cache and data" in boot recovery mode and tried to install a new launcher via Google Play's Website but the result is same: blank screen. What can I do for this error? Sorry for my english.
Note: The phone is rooted and it is automatically connects to wireless router (am I lucky?) and sometimes the "back/home/menu" bar and notification bar is flashing (~0.3sec) for once and then it goes blank screen again.
Thanks for any idea/help.