Front camera and downloading did not work in jio phone

[B. Lyngdoh Lyngkhoi]

I had been using jio phone ( model: lyf-f250y) for about a year, and I have successly install omnisd on my phone. But after 1 or 2 month I found that the front camera option has missing on the camera app. Not only that, when I tried to download any file from browser, it freeze and said download stopped. Even in whatsapp also as well, the download stop whenever I tried to download anything from it. I've been searching on YouTube about a solution for these problem but I've found nothing that related to this problems. Please help...!

For you kind information I'll remain grateful

Thanking you all members