I used the wzsx and the mb TWRP. However I switched and tried to push the file via adb. no sucess. But after the third switch between the TWRPs, with TWRP 3.5.1_10-MB-v.1.2 I were able to copy the large file directly. Whyever it din't work immediatly, but now it worked!
So now it's done...and my...