Unable to flash TWRP on a LG G4 (LG H815)

I own an international LG G4 LG H815 and running Ubuntu 14.04 LTS. For the whole day I am unable to flash TWRP on the phone. First I unlocked the bootloader with succes. Now I am trying to flash TWRP on the phone, commands that I used are : mark@Mark-PC:~/Bureaublad/LG_G4_unlock/Root$ adb reboot bootloader @Mark-PC:~/Bureaublad/LG_G4_unlock/Root$ sudo fastboot flash recovery twrp-2.8.6.0-hima.img target reported max download size of 536870912 bytes sending 'recovery' (35928 KB)... OKAY [ 1.440s] writing 'recovery'... OKAY [ 0.353s] finished. total time: 1.793s After flashing I immidiately turned of the phone by pulling out the battery to prevent normal booting. Every time I boot in the normal stock recovery that offers my to perform a factory reset. I was reading the question https://android.stackexchange.com/questions/133490/flashing-twrp-on-lg-g4-no-error-but-no-twrp but tries were also not succesfull. Chosing yes in the stock recovery wiped the data instead of booting to TWRP. I tried the same with different versions of TWRP for the LG H815 and of them gave the same result. My LG G4 is running Android 5.1 stock ROM without root. I was also unable to find a file to flash by using fastboot that offers root access to flash a recovery from Android. All of the methods to root requires a working TWRP recovery. mark@Mark-PC:~/Bureaublad/LG_G4_unlock/Root$ sudo fastboot boot twrp-2.8.6.0-hima.img Booting of the image directly did also not work I will be very happy when I am able to salve this problem. Now I tried this manual on another Windows laptop : https://techbeasts.com/2015/06/16/install-twrp-recovery-on-lg-g4-root-it/ but after the commands C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot boot recovery.img downloading 'boot.img'... OKAY [ 0.710s] booting... OKAY [ 0.400s] finished. total time: 1.117s unfortunately it boots normal after 20 seconds and stays unaffected.