This method tested by me if you have Lenovo K4 Note A7010a48 device in that issues of like hang on logo, restarting problem, pattern lock, screen lock then you can use this guide and this without any box you can do just before use remember of must be charged your device battery cause if low device turns off during the process not starting so carefully use.
Before use save your data which is in device cause some impotent like contacts, messages, emails, photos, videos, calendar, notes etc if in SD Card so no need to backup but I suggest first remove SIM Card, or SD Card in device after following this guide or need hardware related that to be working well  which is device volume up, down or power keys for that solve need keys. Must be charged a battery up to 75% now let's go how to solve above issues using this guide ?

Procedure

  • Press and hold Volume Up + Down + Power button until Displayed Lenovo Logo after that leave all buttons
  • Now go Download and choose "Clear data" from the Volume Down key and Press Power key for confirm
  • Choose "Delete user data" using Volume Down key and Press Power key for confirm
  • Data Other than preset resources will be deleted. Continue? Choose "Yes" using Volume Down and Press Power for confirm wait until clearing
  • Go down and select "Clear user data" using Volume Down key and Press Power key for confirm
  • All Data on the Phone will be deleted. Continue ? Choose "Yes" using Volume Down and Press Power key for confirm wait until clearing
  • You will see Wipe data processing after that done
  • Last select "Restart" wait for device start normal a few minute
  • Congratulation you are done
Note : If  Hang on logo, Restarting not solve using this guide then follow above relate post