Ktag Operation Not Allowed [updated] -

In rare cases, extremely cold ECUs can have timing issues with the processor. Ensure the unit is at room temperature. Are you working in Boot Mode or Service Mode (Bench) ?

Many modern ECUs (especially Bosch EDC17 and MED17) feature (Tuning Protection). If the KTAG protocol you are using does not support the specific level of protection on that ECU, the software will block the operation to prevent "bricking" the unit. 2. Incorrect Protocol Selection ktag operation not allowed

Verify that your or bench pins are making solid contact. In rare cases, extremely cold ECUs can have