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A question about OpenOCD+nrf51822

I believe what I am asking is extremely specific, but keeping hope that I might get some direction

I have used a clone ST- Link v2 programmer to download code into a NRF51822 Cortex M0 SOC from Nordic. In short, I have been following this guide here

icarus-sensors.github.io/.../starting-with-nRF51822.html

When I try to erase the flash of the chip using OpenOCD as said in the guide, I encounter this error

When I execute

nrf51 mass_erase The terminal says Unknown device (HWID 0x00000057)

Is this that the NRF51822 device is not recognised on the STLink is not recognized?

Further digging reveals that neither the OpenOCD nor the ATTN-51 document from Nordic talks about a device having a HWID as 0x0057. Could this be a clone device?

Can someone assist me? Thanks in advance!

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