Hi, the unlock is possible. I hope the phone is still in a working state? Then the downgrade + unlock should do the job.

@akash95 What do you mean by days remaining? I have refunded your purchase since I don't think you even understand how it works. Have a good day ahead.

Hi, yes, the downgrade is possible :)

Hi, your bootloader is already unlocked?

Hi, IMEI repair is possible if you have lost your device IMEI. But IMEI changing is not. That's not something that's legal. So, as long as you can show a proof of you owning that IMEI, maybe we can do something.

Hi, please use a new version of OST LA. Try using OST 6.2.8. A patch is available on XDA.

VoLTE is actually a carrier service and both the phone maker and the carrier need to work together to enable it. Not having VoLTE shouldn't cause call drops, but since LTE network cannot take voice packets, the phone needs to fallback to 3g/2G mode during calls, which can cause the line to be interrupted.

The repeater does not support connecting to hidden networks. However, you can try by first making the connection and then setting the origin network as hidden. Might continue to connect :)

Hi, the unlock key only worked until July 208. You need to buy the remote service instead.

Hi, I am not sure which IMEI will work in this case. I kind of never encountered such a device.