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You mentioned in your post’s title that you updated the firmware for you Nano S, however your post itself says you have a Nano X. Depending on which device you have, the storage capacity will indeed differ.
The Nano S was one of our earlier hardware models, and so the storage capacity for this hardware model is smaller than our more recent hardware wallet releases (such as the **Nano S Plus** or the **Nano X** devices).
You should absolutely be able to uninstall and reinstall any/all crypto applications and manage your coins/tokens in that manner (and your funds are completely safe while you do this).
For example, if you want to manage your Bitcoin and Dogecoin, you can install those applications, perform your BTC and DOGE transactions, uninstall those applications, and then install any other desired applications – and continue to transact!