Not much to be done in hindsight, sadly (and possibly thankfully since it would jeopardize crypto if one could just bypass all security of a physical device!
)
To mention on earlier topic, there was actually some guy with a Trezor a while back who lost his pin and somehow (with help) managed to get the PIN-code out of the device after alot of work.
But this was patched, and we can assume that any active exploit isn't common knowledge, since it requires a lot of knowledge in the first place.
And also, it's Trezor, not Nano Ledger.
Nano Ledger is Closed-Source so it'd seem much more difficult to "reverse engineer".
With a seed phrase, you can recover your private key, but that obviously doesn't help much in this case.
However,
hopefully you only uninstalled something and didn't lose actual access.
If you do get your access back, send your BTC somewhere, generate a new wallet, send it back, and
keep that seed phrase safe and in multiple locations!
(online is fine if you make sure you encrypt it, or jumble it with a dictionary or something along those lines).
A few months old discussion about someone losing his seed phraseLong and interesting story of the guy with his Trezor