There is another path. Most severance packages would be less than $250K. You have very good odds for making more by hiring a good lawyer on contingency terms (lawyer does not get paid if the suit is not settled in your favor) and taking Qualcomm to court.
Keep emotions out of it. Don't do this out of anger or feelings of revenge. It will take a while, be patient. Use your Qualcomm training and do your home work. Qualcomm legal and HR are actually quite inept and lazy and will make mistakes the longer the suit goes.
Have fun.