Hi, if you're still on an old update, then you can unlock it. If not, you can no longer unlock it again by yourself. And you will need the remote service again.

Not very sure what went wrong. The full log of OST LA will be more helpful than this error code. Also, you can consider using NOST tool instead. It is a modified and slightly improved version of OST 6.0.4.

Hi @StirlizZ, we didn't find any ways to unlock it. Most likely, it won't be possible since Nokia is so unwilling to let that happen.

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.