What is Reddit's opinion of KOOBOOK 1Set CH341A 24 25 Series EEPROM Flash BIOS USB Programmer+SOIC8 SOP8 Test Clip+SPI Flash 1.8V Adapter+SOP8 SOIC8 to DIP8 Adapter Socket Converter?

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If you can't even get into the download mode (I think they call it bootloader now) then you just might have a hardware issue, or a very low level boot issue, that can only be fixed by writing to what I would have thought was ROM (read-only memory) on an SPI EEPROM (Electrically Erasable Programmable Read Only Memory, fancy word for the precursor to flash storage)

On some more open source devices for embedded, the boot process is handled by u-boot. Raspberry pi use their own proprietary bootloader developed in partnership with Qualcomm, partly to lock down certain features like the camera MIPI and DSI interface. Most phones are locked down at this low of a level, closed source, trade secret, and undocumented.

If it were anything like a computer motherboard, those often have small SPI SOIC8 SPI EEPROM chips that store the BIOS and when the BIOS or UEFI are corrupt you can buy these SOIC8 chip readers to read the contents of the SPI flash and overwrite it with the correct binary to restore functionality. Doing this to a phone would require microsoldering and an experienced hardware hacker.

Something like this could help to re-flash the BIOS:
https://www.amazon.com/dp/B07VMPZFWH/
It includes the CH341A programmer, 1.8V adapter and a test clip to connect to the BIOS chip. Only if you are comfortable with finding and trying the right software/driver for the programmer.

Otherwise ask ASRock support or try RMA.