I've gone through as many steps as I am able to and can think of so to rule out any alternatives such as the image not flashing correctly, but I think there may be something wrong with the image as looking the instructions for the board are to simply flash the image to an SD card and it will boot. Yet watching the console output for whatever it's not detecting uboot which I believe is supposed to be included in the image, unless for some reason it isn't though that wouldn't make any sense.
The information available for the board specific to OpenWrt is a bit messy due to it sharing two separate processors and thus are technically split into separate models, but I was able to eventually find the Techdata page specific to the model I have which states it has support since only recently on 24.10.0, with the instructions part of the git commit to just flash the SD card image which is what I did. I tried both under Windows and even Linux and with different SD cards, originally with 24.10.2 but also 24.10.0 and none of them will boot for me. The only thing I haven't tested I with a different SD card reader as I don't have without going out and buying a new one.
Here's the console readout which doesn't show much aside from that it can't boot.
BootROM - 2.03
Starting CP-0 IOROM 1.07
Booting from SD 0 (0x29)
SD - wait_for_sd_interrupt: Error interrupt - 00008000
SD - wait_for_sd_interrupt: Error interrupt status 00000003
SD - sd_get_cmd_response: Get command response failed.
SD - sd_init: Failed - ret = 00000081
Error: Failed initializing interface
Error: Failed boot attempt 01. error = 0x0C1
BootROM - 2.03
Starting CP-0 IOROM 1.07
Booting from SD 0 (0x29)
Error: no valid header till end of media
pt - 00008000
SD - wait_for_sd_interrupt: Error interrupt status 00000003
SD - sd_get_cmd_response: Get command response failed.
SD - sd_init: Failed - ret = 00000081
Error: Failed initializing interface
Error: Failed boot attempt 02. error = 0x041
BootROM - 2.03
Starting CP-0 IOROM 1.07
Booting from SD 0 (0x29)
Error: no valid header till end of media
pt - 00008000
SD - wait_for_sd_interrupt: Error interrupt status 00000003
SD - sd_get_cmd_response: Get command response failed.
SD - sd_init: Failed - ret = 00000081
Error: Failed initializing interface
Error: Failed boot attempt 03. error = 0x041
BootROM - 2.03
Starting CP-0 IOROM 1.07
Booting from SD 0 (0x29)
Error: no valid header till end of media
pt - 00008000
SD - wait_for_sd_interrupt: Error interrupt status 00000003
SD - sd_get_cmd_response: Get command response failed.
SD - sd_init: Failed - ret = 00000081
Error: Failed initializing interface
Error: Failed boot attempt 04. error = 0x041
Trying Uart..