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ezW2Correction can generate the file that you can upload SSA easily. Please check this guide

How to upload
http://www.halfpricesoft...e-w2-form-ssa-upload.asp 

Upload W2C is almost the same as upload W2. Just make sure you choose W2C in this screen
http://www.halfpricesoft...ges/ssa_efile_step_2.jpg 

Thank you.

If you have further questions, please contact us directly at services@halfpricesoft.com
Small business payroll & tax software solution
http://www.halfpricesoft.com 
Do you know the process of how to load the file to submit? It looks like they want the information entered on their website. I don't see a place to upload and submit a file.