No, initially I try just " AFU236U.exe /i1503.ROM" and load setup defaults after reboot. In case you are still interested, I can flash original 1503.ROM back and try to flash again modded one now with "/pbnc /n"
Why ? You already have Slic 2.1 in bios flash utility included in P5E3-1503_SLIC5.rar - AFUDOS engineering edition