Could you post the.... BigBoss Post ...for us thanks...winpwn 18.104.22.168 works perfectly if you follow bigboss' tutorial to the dot.
i set the custom firmware options with cydia, installer and youtube fix with 551mb partition size and winpwn on vista 32bit created the ipsw without problems.
put the 1st gen 8gb iphone (1.1.4 unlocked with iLiberty) into proper DFU mode (follow bigboss' guide on this too) and shift-restored the custom ipsw without any errors on the first try. bootneuter also ran without problems.
i also got itunes to restore from backup without any errors, so i DIDN'T lose any of my contacts, sms messages, photos, wifi settings, etc. i DID need to re-sync all my songs though but that's expected with a restore. i thoroughly tested my phone after i did the backup restore and my mail app didn't crash and itunes also never asked me to restore from backups/setup as a new phone a 2nd time. i did a burn test which basically consisted of turning on and off the phone several times, connected and disconnected on itunes, restarted computer and connected and disconnected again. tested wifi, locate me and it all works perfectly.
maybe i'm one of the lucky few? or maybe i just did everything correctly =P