Keep your device offline it should work without further updates. i think dji can get you with lightbridge though. Not sure.
Feel totally shafted £699 for a P3 advanced.(DJI.com) I paid £899 a few months back. So DJI are limiting more & more where we can fly and single handily decreasing the residual value of their product. Give it another 6 months and the product will be worthless & unusable. If its a 10 year anniversary sale why don't they allow their existing customer base celebrate it by reducing the price of batteries & accessories also.
Obviously very little thought was given to customers who had made a significant investment prior to their anniversary.