Verykool T742 - Manual (Page 33)

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Factory data reset
If this machine is infected, or third party software installed to run this machine
is unusual, but through the recovery factory Settings, remove the third party software,
and restore the state out by default. Into this machine "Settings"-" privacy ", select
“Factory data reset" item, confirmed, will remove all of the data.
Upgrade Player Driver
The firmware is a built-in program, by which you can run various hardware
functions. By upgrading the firmware, you can improve or enhance the performance
and functions of the player. No upgrading the firmware will not affect the normal
operation of the player itself.
The upgrading of firmware may lead to the unit unable to work properly due to
error operation. Please read carefully the instructions for upgrading before upgrading.
Note. Please make sure that players have the upgrading at more than 60% of the
battery power. Avoid because the battery power leads to upgrade failure to boot.
2. The upgrade process do not reset or shutdown operation, avoid accident
interrupt upgrade can't boot.