cool how u just kept adding important info slowly instead of at the start/ :p
it is not weird to see a device work fine with one drone and then not another drone. peeps say it all the time here on the forum
p2 does not work with p3. see here the list of what could work for u.
p3a does not work with wifi like that. rc connects with a cable from your device to the rc.
100% do not update anything until you know more
afaik u can use multiple drones with the same device and same account.
i'd bet a p3p not used for that long will prob not work anymore. prob the batteries bad or the nand memory. maybe it will work if you use the rc youve bin using.
dont update anything b4 u figure more out!