(Tutorial) How to Format/Hard Reset Nokia Lumia Windows Phones?

There are many scenarios when you need to reset/format your Lumia Windows phone – frequent restarts, boot loop issue, phone is not starting due to corrupt firmware or any other malfunction. The cause of such malfunctions may either be a software-issue or a hardware one. Software-related issues are relatively easy to solve (by an average user) rather than the hardware ones which require professional service and tools. Here I will try to explain some easy reset/formatmethods for Nokia Lumia phones WP 8/7 (Lumia 800, 900, 510, 610, 710, 520, 620, 720, 820, 525, 625, 920, 925, 928, 929, 1020, 1320, 1520 etc) – which can solve most “soft-brick” issues for these devices. Phone format is frequently required in following conditions –

a. If the phone is not booting up or get stuck at boot screen
b.