Pre Requirements To Install TWRP On Ulefone Be Touch 3:-
1- With flash tool load MT6753_Android_Scatter TWRP.txt
2- Select download and connect the smartphone to pc (smartphone must be powered off)… in a few seconds will start the process and the new TWRP will be flashed.
To restore original stock recovery, you need load ad point 1 the file MT6753_Android_Scatter- stock.txt
P.P.S to enter in the recovery, power off the smartphone, push VOL + and Power at the same time, you will see their words with VOL + you move selection, with VOL – you must select Recovery
To have root flash with TWRP the archive supersu.zip found here: https://download.chainfire.eu/696/supersu/