If you entered *#*#83781#*#* and nothing happens, or the AT command returns ERROR instead of OK , you are facing one of three problems:
To use these codes, open the stock phone dialer app on your Spreadtrum device and enter the sequences exactly as shown. The engineering or testing menu usually appears automatically upon typing the final character.
Here is a technical guide regarding IMEI repair on devices running on Spreadtrum (SPD) chipsets. spd android imei repair code
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This is a professional-grade solution often used in repair shops. It supports SPD, MediaTek (MTK), and Qualcomm devices. It has two modes: one that works without pressing buttons and another that requires specific key combinations to force the phone into download mode. If you entered *#*#83781#*#* and nothing happens, or
Open , select the appropriate COM Port, enter the correct identification digits, and click Mode Select -> Normal Mode -> Start . Crucial Legal and Security Warning
Tap on "Phone 1" (for SIM slot 1) or "Phone 2" (for SIM slot 2). This public link is valid for 7 days
This lightweight Windows utility communicates directly with the phone while it is in DIAG (Diagnostic) mode.
Requires: Root access + busybox installed.
Before proceeding, locate your device’s original IMEI numbers. These are typically printed on a sticker underneath the battery, on the original retail box, or on your purchase receipt. Step-by-Step Restoration Process Open the dialer and enter *#*#83781#*#* .