An analogy: would You accept an ILS without a working glideslope needle or a visual in IMC? Flying an approach based on data Your systems cannot receive, digest and display appears a brave choice in most circumstances.
If other approaches to the same runway or airport based on different nav equipment up to and including a visual are available, pick them. If not, there may be ways to get Your onboard equipment working again. And if all this fails, consider a diversion.