samsung a600f patch cert failed

samsung a600fn after imie repaired , cant patch cert
Preparing...
Checking current patchcert.
Checking modem.
Checking root.
Checking boot image. Be patient! Do NOT disconnect the phone!
The knox is still valid. Because of the boot patch the warranty will void.
Writing boot image.
Restarting phone.
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!
Reading data...
Checking modem version.
Unable to patch certificate.
Finished at local time: [03.12.19 16:03:37]
WorkID: 54569733

i tried modem from combination still same