uncorrectable

/ˌʌnkəˈrɛktəbəl/
adjective
  1. Not able to be fixed, improved, or made right.
    • His spelling errors were so numerous that the teacher declared the essay uncorrectable.
    • The software had an uncorrectable bug that forced the company to rewrite the entire program.
    • The damage to the hard drive was uncorrectable, so all the data was lost.