BF539 on board programming


I'm looking for the easy & low cost solutions for programming BF539 on-chip flash, just do programming, not need develop & debug.

I've checked the manual, it would be able to use emualtor ICE-1000/2000, and utility SAFP to do this, but I'm facing the problem is that I could not get the related file(*.dxe, *.ini, *.idr), the project is developed a few years ago, just a s-record file(hex format) on hand.

Could you advise other options? Thanks.