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CC2538: JTAG, issue when "Unlocking the Debug Interface"

Part Number: CC2538


Hi everyone,

I am trying to follow the steps for mass erasing the flash of the CC2538SF53 device in order to unlock the debug interface, without success.

I do the "Public Connect Sequence", than the "Private Connect Sequence" and the 0x0D and 0x0E scans to the IR.

After that I read many times the value in the DR with the intention of monitoring the masserase status but I always get 0x00 as a response.

Am I missing something? Should I do something in a different way?

Thank you in advance.

EDIT: I work for a company which builds its own universal programmers, so I cannot use third party debuggers or software.