It was the only way to get it out of the first crash-loop.
I have since gone and downloaded the Bootloader according to this: (How to reflash the bootloader with factory firmware | Seeed Studio Wiki) but of course that’s Windows-only, so I just downloaded the boot loader, and used esptool.py --chip esp32c3 --before no_reset --port /dev/cu.usbmodem83201 write_flash --flash_mode dio --flash_freq 80m --flash_size 8MB 0x0 ~/Downloads/ESP32-C3_RFTest_108_2b9b157_20211014.bin
That has not been helpful either.