I have btc in my nano ledger s plus.  Idid a few transactions a while back but haven't done any recently in a while.  I haven't even connected my nano ledger s plus to my laptop in many months and it's still using old firmware 1.1.1 and using an old version of ledger live 2.85.1 as well.  I do open ledger live to check balance and it synchronizes and balance is correct.  Everytime I close ledger live, it ask me up to update but I just close it.


I'm currently outside the US.  So I will update ledger live when back in the US and then update the firmware as well for the nano ledger s plus as I am many versions behind.  I am on firmware 1.1.1 and it's 1.3.2.  How big of a concern is this?  It's several versions behind so people say if you go too far back, you might not be able to update it.  I am planning to update the nano ledger s plus firmware when I go back to the US as I have the seed there.


At the moment, how do I check the amount of btc I have in all my btc addresses?  I did transactions from a while back and I know when you send btc or receive, there is many change addresses.  I recall a while back doing this by copy and pasting the last change address and entering that btc address to blockchain.com to check my current btc balance in it?  Is that the site to copy and paste your btc address to which would show the balance and previous transactions?  I recall it was something with similar name to blockchain but don't recall the name.  There are many right?


The other thing is this.  How do I know how many btc addresses I have on nano ledger s plus that has all the btc?  I have to check every single transaction I did and click on it and check the last btc address that it was sent to right?  So that means I could have anywhere from a few to maybe 30 btc addresses with btc in it?  Thus some may have 0.00002 but some may have 0.01 etc?  Is that how it works? 


Now as long as ledger live even though it's an old version shows it's synchronized, then the balance in your btc has to be correct or not?  I heard a while back people downloaded new ledger live and after synchronizing, it showed incorrect amount of btc right?  So the only way to check for sure besides connecting your nano ledger s plus to laptop and getting a send address to send would be get every single btc address you have and check the balance of each?  I recall when using electrum and keeping btc in electrum, you could check all your addresses and click on each and it showed the balance of each very clearly.  That is how it is like with electrum right?  But what about the nano ledger s plus with ledger live?  Do you keep going to the change address and transactions until you add all the btc to the total btc amount?