Twrp Apk Root. The boot image flashing is for flashing full boot images not just kernel zimages and should not be used for flashing twrp. Flash a magisk or supersu root file via twrp.
More info from playstore. Before installing twrp you will need to install the android sdk tools. Unlock developer options.
We will add the ability to use additional storage locations very soon.
Before installing twrp you will need to install the android sdk tools. More info from playstore. Any issues or errors within the recovery should be addressed with team win. Note that you should flash twrp images to recovery.