No, the addresses and balances are on the public ledger. These are linked to your 24 seed words (or 24 plus 1 secret if you use the plausible deniability). The apps aren't holding your balance, they are only a way of interacting with the public chain.
Just make sure you have your seed words in case anything goes bad.
Awesome...cheers!
Try it for yourself, to see how it works. Before doing the firmware update.