A hard reset will clear a consumer set pass code, unless it is stolen, reported stolen or the code to open has been entered wrongly 4 times. Then it becomes PUK/SIM locked. EXCEPT, now I looked it up, this is a home phone!
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Replacing this function will lock the phone for further programming until reset through the telephone system. 8. If the display slot is not already used, the ...
If you want to reinstall the operating system or upgrade your device, you can use a flash file. This file helps to get back your phone in factory format. It can fix software issues, Boot loop issues, IMEI issues, and dead issues. These files are unique for every phone
https://firmwareflashfiles.com/lenovo-a6000/
arrow keys to locate the option Call Settings.... arrow keys to locate the option Show Phone Screen. arrow keys or press the On/Off soft key to change the setting. number and name.
Power surges damage electronics that power up devices. The surges push too much current into the units sensitive controllers and thus damage the units beyond repair.
As a system ages, it declines just like people and thus tend to break down gradually. Power surges just make electronics go faster down hill.