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I'm trying to follow this guide to activate serial bootloader on cc2538 using raspberry pi and OpenOCD. After connecting micro controller is seen by OpenOCD Info : JTAG tap: cc2538.jrc tap/device found: 0x8b96402f (mfg: 0x017 (Texas Instruments), part: 0xb964, ver: 0x8) but then I getting Error: Invalid ACK (6) in DAP response and I can't proceed.

I tried Raspberry Pi 2 and 4. OpenOCD package from repository and freshly build from source.

Thanks for any help.