"How do I restore Apps icon?"に関する回答Home screen>pull down finger to open "search">try to search it. If not than go to play store for that apk and reinstall it.
"Why is touchscreen not working but hardware buttons do?"に関する回答When you are replacing display you have to change touchscreen too,I havemany problems on my LG L Bello after changing display and LCD Touchscreen.Every phone has its original touchscreen and display/digitizer and if you are doing it on Huawei or Lg g2,g3....devices there will be some problems caused for sure.Did you try connecting it on PC and download new firmware?
"I cant open my pictures and videos"に関する回答Do you have old or new memory card inside your phone and did you shared files over bluetooth from (exp. LG L Bello or some other) to Huawei?