← All KRA eTIMS Error Codes
903 Official

Device Type Mismatch

A VSCU serial was used on an OSCU endpoint or vice versa.

This is unrecoverable without a manual KRA re-provisioning process. Contact timsupport@kra.go.ke. There is no self-service path.
Developers who copy a device serial from VSCU documentation and test it against the OSCU endpoint are permanently blocked until KRA intervenes.