Two years ago I did a M.Sc. in cognitive Neuroscience and then started working as a DL / ML-Engineer up until now. Back then I got two positive reference letters for a specific graduate program from my supervisors.
I want to do a PhD now, but I wondering how I should deal with reference letter requests. In my current company there is no one with technical expertise in Data-Science or Machine-Learning whatsoever.
I see two options now:
a) Should I ask my old supervisors to update my reference letters?
b) Should I just send the old ones, maybe adding some short note why the reference letters are old and obviously for some other program?
Any recommendations on what to do?