Open a trim file
Copy the content from <Data>…</Data>
Paste it into CAT Trim File calculator
Here you can find the InjectorSeriaNo is same as the one in trim file
Now input new injector serial number then click “Change” button
Content between <Data>…</Data> will renew,now copy it and paste it into trim file
And change the InjectorSerialNo and DATAChecksum you input in the Cat trim file calculator
After then save this file and change the file format as .trm