To install:
First, the old cable has to go. Therefore one must VERY CAREFULLY remove the battery, as this on the bottom has a board.
For the installation of the new cable very great sensitivity is required because you have to remove the whole mounts on which the switch gets stuck, scrape the old switch, the new glue (which is due to poor adhesive strength not easy ^^). Until I was done with everything I had invested about 1.5 hours. But it was worth it: all keys Tuen again (with me the silent switch was broken) and I can use my phone finally =)
THANK YOU!