It is free, uses no external hardware dongles, and works permanently if the filesystem is intact. The "best code" here is the AT+EGMR command.

RDA All In One Tool Collection For Mobile and Smartwatch Free 13 Aug 2024 —

: This is often considered the most reliable tool for Coolsand/RDA devices, capable of formatting and removing security codes in addition to repairing IMEI. Important Legal & Safety Warning

If dialer codes do not work or are blocked by the firmware, hardware technicians use dedicated flashing and service tools.

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