You can convert RC5 codes to long pronto hex with the makehex program (the process is described in many other threads at RemoteCentral).


But 00eF is not a valid RC5 function number. (lower/upper case doesn't matter, 00ef or 00EF would be equally invalid. Only 0000 through 007F are valid).

I expect you really meant 003F. Hex 3F is decimal 63. The number before it (0000) is what makehex calls "device" so you would use rc5.irp with device=0 then select function 63 from the output (in makehex output the pronto hex is of course in hex, but device and function numbers are in decimal).

Depending on the version of universal browser you are using it may be easier or necessary to convert the output of makehex to a ccf file with hex2ccf or irpanels before dragging the desired function with universal browser.