I had the same issue after nearly 9 months of usage. I went to the service centre and they refused to repair it as the phone is an out-of-serviceable repair product or something like that, they said. In short, the company stopped making the spare parts, so the only option is that the service centre people will tell you to get a free-of-cost replacement with PocoX4 Pro (only if the previous model is still under warranty). Otherwise, you need to buy a brand new phone regardless in both cases, your data is gone if you don't have any prior backup.