How can an NRI update PAN status from resident to non-resident and update citizenship details?

If the PAN is very old, I would first check exactly which details are currently recorded against it. Then submit a PAN correction/update request for the required fields.

Not having Aadhaar doesn't necessarily mean you cannot maintain or update a PAN. However, the applicable process and document requirements depend on your circumstances, so I'd verify the current instructions rather than following an older PAN correction guide.

I had a similar issue where my details were updated on the income-tax portal but the PAN records didn't immediately show the same information.

The important thing is to make sure the information submitted in the PAN correction application exactly matches your supporting documents. For an NRI, I'd also check the requirements for foreign address and citizenship documentation before submitting the correction.

You generally need to update the details through the PAN correction/update process, rather than relying only on the information shown on the Income Tax e-Filing portal.

Since you're an overseas citizen and don't have Aadhaar, check the current PAN application procedure for applicants who are not eligible for Aadhaar. Your foreign passport and overseas address documentation may be relevant.