### Chinese: 4.定制产品非质量问题不予退换货。
### English: 4. Customized products will not be returned for non-quality problems.
### Errors: There is a major error of incorrect translation is missing content from the correct translation at "will not be returned". There is a major error of incorrect translation includes information not present in the correct translation at "non-quality problems".

### Improved English: 4. Exchange or return of customized products is not supported unless there is quality issue.