Router and sometimes client

Thanks for your time and patience ! you are right I have serial working. DD-wrt does not change anything to bootloader partition so flash dd-wrt is not dangerous for U-boot start up properly ?

I know my version, what firmware to flash, what is dd-wrt, bootloader, tftp and other things. I only do not know if the wrong firmware can delete the bootloader from Flash chip and this is what I am...

1.Router is not bricked. It works. Mine has the same bootloader version as in dd-wrt forum. Did you mean chinese version as 2 ver of this router ? I have the serial console as some warranty what if I...

Nevermind. So the question was: How to not damage the bootloader with firmware update of dd-wrt or tp-link firmware?

Sorry I do not understand. I am not roypaun user