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1 : Copy bconf.fxe and conf.zpr (or your any conf.zpr you've made with ZPR maker) in the gp:\ directory
2 : Launch bconf.fxe
3 : Rename the firmware file into fw.bin (amfw50a.bin include Yafl 0.3 and amfw50b.bin include Wind-Ups 1.0) and copy it in the gp:\ directory
4 : Copy fw.fxe into your smc, put new batteies in your Gp32 and launch fw.fxe