Does the console power on after fixing STBY_CLK?
To update your JRP set the BL switch towards the "
JP-BL" text, reset your JRP, click "
Tools > Update JR-P fw", find "
PICFLASH_E_1_0_5-JRP-V2.HEX" in the "
common" folder and click "
Open".
I am almost positive that the above steps are already mentioned in the J-Runner PDF

.