This: Device Is Locked Due To An Overdue Installment Payment Xiaomi Exclusive

This is the hardest scenario. You have two options:

Before buying a used Xiaomi:

Websites like UnlockRiver, DoctorSIM, or local phone repair shops offer “finance lock removal” for $30–$100. They use leaked Xiaomi service codes or server exploits.

Xiaomi has integrated a Financial Lock (Cash-on-Delivery / EMI Lock) into its MIUI/HyperOS software for devices sold through specific financing partners (primarily in markets like India, Indonesia, and Latin America).
If a user purchases a device via an EMI plan or exclusive carrier financing and fails to pay an installment, Xiaomi’s server-side check can trigger a software-level lock, rendering the device unusable.
This is NOT a hardware failure or a Google lock – it is a contractual security feature. This is the hardest scenario

Objective: To secure devices financed through Xiaomi-affiliated partners or third-party lenders by limiting device functionality if installment payments are overdue, while ensuring the device remains usable enough for the user to make a payment.

Core Philosophy:

You must pay the overdue amount in full. Do not pay partial.

If the user manages to bypass the local lock, the "Find Device" (Mi Cloud) infrastructure sends a kill-switch signal that overrides local states, ensuring the lock applies even if the app is tampered with.