I have uninstalled and reinstalled the app and I get the same error.
What app are you installing/uninstalling?
I came across
this reddit post where another user had the same error on the Nano X while using VeChain. He got it fixed by installing the latest VeChain app on his device. Try and uninstall your apps manually before updating the firmware, maybe that will fix it. Or updating them to the newest versions.
There are several threads where people complained seeing that error in connection to their Litecoin, but like you said, they fixed it by installing the newest firmware and LTC app.
If I use electrum, it doesn't matter if I don't update the firmware? I guess it is better to update, isn't it?
Yeah, you should still be using the latest firmware for various reasons such as vulnerability and bug fixes, stability improvements, etc.
Is your Ledger Live updated to the newest version which is currently 2.35.2?