Sorry to say but I don't think there is too much hope of recovery even if you had used the 6.0.1 upgrade rather than install package as it is not possible to "downgrade" versions.

Did you by any chance make a backup of the database prior to either the upgrade from 6.0.1 to 6.1.2 or prior to trying to "downgrade"?

If the site is remotely hosted have you checked with your hosting provider to see if a daily backup of the site files and database taken prior to the first upgrade attempt might still be available.

Do you have a backup of the old (6.0.1) web.config from which the machine keys can be obtained?

At what point in the failed upgrade attempt did the upgrade "hang"?

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

SOLVED

I found this online somewhere else and made it work.

 

Declare @UserName NVarChar(30)
Declare @Password NVarChar(30)
Declare @Application NVarChar(255)
Declare @PasswordSalt NVarChar(128)

set @UserName = 'UserName'
set @Password = 'Password'
set @Application = 'DotNetNuke'

Set @PasswordSalt = (SELECT 1 PasswordSalt FROM aspnet_Membership WHERE UserID IN (SELECT UserID FROM aspnet_Users u, aspnet_Applications a WHERE u.UserName=@UserName and a.ApplicationName = @Application AND u.ApplicationId = a.ApplicationId))

Exec dbo.aspnet_Membership_ResetPassword @Application, @UserName, @Password, 10, 10, @PasswordSalt, -5