How do I remove an unknown iCloud account from my device?

If you’ve been swapping internal hardware parts around, you just met Activation Lock.

Which is now tied to major parts.

About Activation Lock and Self Service Repair - Apple Support

You’ll need the person holding the Apple Account associated with the part to release their lock.

If a third-party repair provider swapped parts, contact them. They used locked parts.

There's nothing you can do. You took it to an unauthorizes shop that removed the logic board from your phone and replaced it with one from another device that is activation locked to its original owner.

You now own a brick.

Markkimutai wrote:

So those are the only options available

So is it possible for the person who repaired it to remove the locked parts or change it to another one?? Since we can't know the owner of the iCloud.i really appreciate your feedback thank you.

Activation Lock is intended as a theft deterrent, and a theft deterrent that was easy to bypass would not be much of a deterrent.

These parts are indistinguishable from lost or stolen parts, if the parts are not actually lost or stolen.

If the donor iPhone was removed from Activation Lock, then the parts will be unlocked.

Otherwise, the parts are locked.

Sourcing random parts from random places, just like buying used iPhones from random sellers, is risky.

There is a reason why we would only recommend to get your iPhone/iPad serviced at Apple or Authorized Apple Service Provider. They ruined your device and there is nothing Apple can do about it.

What do you mean when you say you “recently changed my phone memory?”

While we don’t know all the details; it seems fairly assured that your phone will never work again.

Sorry.