RAK 7204 stuck in boot mode

Recently I did notice a problem with the RAK7204 module. It was working normally and sending data per its configuration. it stopped its sending process and when I connect to it through usb connection I noticed that it is continuously rebooting. I did burn its bootloader then I tried to redownload the latest firmware. I can not download the firmware and I noticed that it is stuck in boot mode and I can not make it come back to normal operation mode with at+run command. Does anybody have this issue before?

can you check which bootloader do you have - at+version in boot mode?