Why i can't install apk's ?

  1. Model Name: Asus zenfone live L1 (ZA550KL (2gB RAM
  2. Firmware Version:WW_ZA550KL_15.01.2003.137_20200307
  3. Rooted or not: NOPE

ok i was going to install a backup aplication but i can't install the apk and mi phone says "applicaiton not installed" i can't found the optionto allow unknow origins where is it?


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