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Hi, I'm Mr.med. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
I'm sorry about the issue, What is the model of your Nokia phone please? eg : Nokia 800 Lumia
Can you tell me what is the model of your Nokia phone please? eg : Nokia 800 Lumia
Can you find/locate your phone in this link please : https://www.microsoft.com/en/mobile/phones/lumia/#order_by=latest
Let me know
Did you reset your phone? also Do you have a backup of your data (Images, videos, documents ect...)?
Please reset your phone by following the steps below :
Let me know the results
press Volume down before pressing the Power button please
Can you try this please : turn off your phone, and then, press and hold the volume down + Camera + menu keys.Press the power button until your phone vibrates.
Please watch this tutorial video and let me know the results : https://www.youtube.com/watch?v=VCjJrqFzIug
Just to be sure and avoid asking you to do try something twice, can you confirm that you’ve done these things, because this is the only solution to fix this issue :
Please use the Windows Device Recovery Tool and let me know if you fix the issue : https://support.microsoft.com/en-us/help/12379/windows-10-mobile-device-recovery-tool-faq
I'm sorry buy You need a windows computer, try to install Virtual box then install Windows 7 on it
Hi there and welcome
When you power the phone on, is anything showing on the screen during the start process?
No problem, without the model it is hard to do as each has its own reset procedure (seeing the phone would tell the model)
If we can assist you with anything else, please let us know