> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://kb.secondfi.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Supported Networks and Hardware Wallets

The following devices have been tested with SecondFi. Compatibility may vary depending on firmware version and device condition.

> **iOS users:** Due to Apple platform restrictions, USB hardware wallet connection is not available on iPhone. Only Ledger devices with Bluetooth support can be used on iOS.



## Compatible Devices

| Device | Bluetooth | USB | Notes |
| ---- |
| **Ledger Nano X** | Yes | Desktop / Web / Android | Bluetooth is the primary connection method on iOS. USB works on desktop and Android (via OTG). |
| **Ledger Nano S Plus** | No | Desktop / Web / Android | No Bluetooth — connect via USB on desktop or Android. Not available on iOS. |
| **Ledger Gen 5** | Yes | Desktop / Web / Android | Bluetooth is the primary connection method on iOS. USB works on desktop and Android (via OTG). |
| **Ledger Stax** | Yes | Desktop / Web / Android | Bluetooth is the primary connection method on iOS. USB works on desktop and Android (via OTG). |
| **Ledger Flex** | Yes | Desktop / Web / Android | Bluetooth is the primary connection method on iOS. USB works on desktop and Android (via OTG). |
| **Ledger Nano S** | No | Desktop / Web / Android | Limited support — no longer manufactured. Not available on iOS. |
| **Trezor Model T** | No | Desktop / Web / Android | Not available on iOS — see the iOS note above. |
| **Trezor Model One** | No | Desktop / Web / Android | Not available on iOS — see the iOS note above. |
| **Trezor Safe 3** | No | Desktop / Web / Android | No Bluetooth — connect via USB on desktop or Android. Not available on iOS. |
| **Trezor Safe 5** | No | Desktop / Web / Android | No Bluetooth — connect via USB on desktop or Android. Not available on iOS. |
| **Trezor Safe 7** | USB only for now | Desktop / Web / Android | Bluetooth support is coming soon. Not available on iOS. |



## Connection by Platform

| Platform | What Works |
| ---- |
| **iOS** | Ledger devices with Bluetooth only (Nano X, Gen 5, Stax, Flex). USB hardware wallet connection is not available on iOS. |
| **Android** | Ledger via Bluetooth (where supported), Ledger via USB (OTG), Trezor via USB (OTG). |
| **Desktop / Web** | Ledger via USB, Trezor via USB. |

> **Note:** If Bluetooth is unavailable, a USB fallback is available on both desktop and Android. There is no USB fallback on iOS.



## Supported Chains

SecondFi currently supports the following networks:

* Cardano
* Bitcoin
* Ethereum
* BNB Smart Chain
* Solana
* Base
* Avalanche
* Tron

> **Note:** Not all chains may be accessible when using a hardware wallet. 



## Before You Connect

* Make sure your hardware wallet device is **powered on and unlocked** before starting the pairing process in SecondFi.
* For **Ledger** devices, you will be prompted to open the relevant blockchain apps on your device during setup. Open the **Cardano ADA** app first, then proceed with other network apps (Base, Bitcoin, Ethereum, Solana) as shown in the app.
* For **Trezor** devices, no separate apps are needed — all supported networks are accessible from a single interface.

**Related articles**
* [Connecting a Hardware Wallet](https://kb.secondfi.io/en/article/connecting-a-hardware-wallet-kc9gn1/)