PINE64

hi all i think i have bricked my rockpro64 I executed rock64_upgrade_bootloader.sh and now i cant get any output on the serial console nor the white led turns on
i tried jumpering pins 23 and 25 suggested in the wiki but still no output
is there a possibility to unbrik the device?

Fixed it needed a sd card with that one flashed and it updated the bootloader just fine:
https://github.com/ayufan-rock64/linux-u-boot/releases
using the pin 23-25 jumper trick