Change Name is Sysfiles

Our ERP system (JDE) has three enviroments each in it's own SQL Database. The easiest way to refresh the production data to the prototype enviroment is to backup the production database (PS_Prod) and restore it to the prototype enviroment (PS_CRP). This works fine with one exceeption. After the restore we run the following SQLs:
sp_msforeachtable @command1='grant all on ? to public'
and
update sysobjects
set UID = User_ID('CRPDTA')
where UID= USER_ID('PRODDTA')

These work fine
However the name is sysfiles table is wrong. The file path is correct though. Below are the results of query select name, filename from sysfile
PS_PROD_Data   E:\mssql\data\PS_CRP.mdf                                                              
PS_PROD_Log     F:\mssql\log\\PS_CRP_log.LDF                                                        
This causes a problem whenn trying to run the DBBC shrinkfile command

is there a way to change the name back to PS_CRP_Data and PS_CRP_Log in the field name in sysfiles without causing any residual problems?

EVANFAGERAsked:
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Hurric8neCommented:
I tired using the Alter database Modify file option to amend a file name contained in SYSFILES but I got an error message telling me that the file did not exist. Now I know that the file doesn't exist and that is why I want to amend the reference to it in the [name] field in SYSFILES so that I can shrink the log files.

Please can someone tell me how I update that [name] field in SYSFILES, as it's driving me insane.
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