Boot sequence from loader to OpenWrt

i don't understand how its possible that my bootloader does not work anymore. link

Can somebody shed some light on how the boot process works, starting from the moment powering the device to where openWRT init.d processes begin?

What does a bootloader do?

Thanks for that. Its quite short but gives a brief understanding before its hidden under a purchase blocker.
Are there any additional free resources?

Is taken from here:

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