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Unlike Qualcomm (using QPST/Diag mode) or MediaTek (using SN Writer/Meta mode), SPD requires a unique set of and PC-based tools like ResearchDownload , SPD Upgrade Tool , or Miracle Box to rewrite the IMEI. spd android imei repair code
If you entered *#*#83781#*#* and nothing happens, or the AT command returns ERROR instead of OK , you are facing one of three problems: SPD Upgrade Tool
Modern Android versions often block access to these dialer codes for security. In such cases, technicians use PC-based tools that connect to the phone in or Calibration Mode : how to change imei number spd android without pc box including IMEI restoration.
While standard dialler codes are used to the IMEI, dedicated Engineering Mode codes allow for deeper system configurations, including IMEI restoration.