Tinyfpga-bx boot led not blinking it continously on...also shows bootloader not active on terminal


I’m using ubuntu 18.04. I was trying to update the bootloader. but suddenly the led stoped blinking and is continously on now. then on terminal its shows that the boootloader is not active. I tried to activate the bootloader by pressing the reset button but it’s not working …can anyone please tell me the reason and the solution? thank you