RK61Pro - Is this keyboard realy QMK compatible? How do I enter flash mode?

Hey everyone, I bought a RK61Pro with the intent to flash a custom QMK onto the board. It was my understanding that Royal Kludge does somewhat OK flashable QMK keyboards that also offer wireless, but I’m not a bit worried now that this keyboard isn’t compatible. I looked under the space key for the flash button as reported on the RK61 section of mk_firmware/keyboards and there was notably no button where I expected. Similarly, any attempt to hold escape or fn+escape or any of that when booting the keyboard did not result in a bootloader state like I’d expect. Perhaps I’ve been mislead, but is the RK61Pro not a valid QMK keyboard as it’s advertised on Amazon? I’ve had a few issues with this keyboard up until now and was hoping to be able to flash it to remove some of the complex layer-state management that comes with the keyboards default configuration, but perhaps I’ll have to complain to amazon about this product being misleading.