Nano X charges through USB-C and can run on its battery or USB power. Ledger’s battery estimates differ: the product page says five hours without a stated usage mode, while its comparison lists three to four hours in use and eight hours on standby. Keep access to USB power for longer mobile sessions.
Device-app updates and Ledger OS updates are different tasks. Nano X can update Ledger OS over phone Bluetooth only when version 2.4.1 or later is already installed. Below that version, first update over USB from a computer or Android phone. An iPhone alone cannot perform that initial wired update; once it is done, subsequent OS updates can use Bluetooth.
Have a usable recovery-word backup before an OS update. If you are unsure it matches this Nano X, run Recovery Check first; if it is missing or still fails, follow the missing-backup guidance above before updating. Remember that this check does not verify an optional passphrase. Keep the backup available; you do not enter the words into Ledger Wallet to update the device.
To find the installed version, hold both buttons to open Control Center, then go to Settings → General → Ledger OS version.
For a USB update from a computer, connect and unlock Nano X, open My Ledger in Ledger Wallet and allow access on the device. Choose Update OS when its notification appears, read the instructions and confirm the update and PIN on Nano X.
For Bluetooth updates on a Nano X already running OS 2.4.1 or later, connect it to Ledger Wallet mobile and use the update notification. Unlock Nano X when prompted, let installation finish and unlock it again after its final restart.
Follow the Nano X branch of Ledger’s instructions. Keep the device connected while it is processing. After the update and final unlock, Ledger Wallet reports that the OS is up to date and reinstalls the device apps. If Bluetooth pairing needs to be reset, forget the old pairing on the phone and pair again; that is a connection task. If Nano X instead returns to its initial welcome screen, follow the restoration instructions to recover the existing wallet rather than creating a new one.