Really irreversible, or could it be reflashed via so called 'JTAG-cable', and serial terminal, tftp, or maybe even https://www.flashrom.org/Flashrom https://www

Really irreversible, or could it be reflashed via so called 'JTAG-cable', and serial terminal, tftp, or maybe even https://www.flashrom.org/Flashrom https://www.flashrom.org/Flashrom (but then with other cables and plugs, because most likely directly writing into the chip without any intermediaries)?