You can create a new keystore, but the Android Market wont allow you to upload the apk as an update - worse still, if you try uploading the apk as a new app it will not allow it either as it knows there is a 'different' version of the same apk already in the market even if you delete your previous version from the market
Do your absolute best to find that keystore!!
When you find it, email it to yourself so you have a copy on your gmail that you can go and get in the case you loose it from your hard drive!
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…