cant access store from my mobile

[Rasha Hammad]

hi there. i own a 640 XL phone and i had it upgraded years ago to windows 10. unfortunately, one of our hot shots claimed that he was a microsoft nerd and convinced me to upgrade my phone. so what he did was instead of fixing it, he downgraded my software to 8 and accordingly, i cant access the store nor internet. I tried everything: resetting the phone, searching the internet, asking my IT colleagues, etc in vain. my only option is to take it to a technician may be he can help. can anyone help me? thank you

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