Please follow the Steps Correctly..
Use this Twrp ( SD card access enabled thanks to CosmicDan):
http://www.mediafire.com/file/cbiy2084dylmb1h/twrp-3.2.3.0-beryllium-20180831_microSD.img.7z/file
For New Recovery Rom Flashing...
1.Flash Fastboot recovery , Go to recovery ( Volume+ Power)...