Yes, you can update a challan in filed e-TDS Return. For corrections in PAN master, personal information, deductee details, and challan details, there is no need to request for Conso file (file correction statement).
Payer/ Deductor can make a correction using the service ‘Request for Correction’ on TRACES. Payer/ Deductor can perform the correction in Challan Details provided the regular return is processed and DSC of a responsible person is registered with TRACES.
If not then the payer/ deductor needs to file a correction statement (Revise Return) by downloading Conso File from TRACES.
Read More: How to update challan on TRACES?