SIDELOAD Mode
How to enter devices into SIDELOAD mode — steps for popular brands and models.
Sideloading helps flashing ota zips or flash files through ADB sideload option from recovery mode !
you can see this option in recovery mode
( Mi Assistant mode in Xiaomi)
(Sideload in Samsung)
Some times it needs to flash custom recovery to see such option !
More about this topic can be found here :