Connecting a hardware device to a software wallet is convenient, but sometimes the middleman — the Bridge — stops working. If you searched for "ledger live metamask bridge not working" or saw the error "cannot convert string to buffer metamask," this guide lays out practical, step-by-step fixes I use regularly when the bridge hiccups. I’ve been using a hardware device with MetaMask for months; what I found is that most issues are environmental (software versions, USB, or wrong connection mode) rather than permanent device failures.
Short answer: the Bridge is the glue between the browser and the hardware device. When that glue breaks the browser can’t talk to the Ledger device, or messages get malformed (hence errors like "cannot convert string to buffer metamask").
Common causes:
Why does the JavaScript error "cannot convert string to buffer metamask" show up? Usually the extension expects binary data (Buffer) but receives a JSON string or an unexpected response from the bridge. Updating software and switching transport often clears that mismatch.
Below are practical steps. Try them one by one and test after each step.
Why this helps: mismatched protocol expectations are a leading cause of bridge errors.
MetaMask offers different ways to connect. If one fails, try the other.
And yes, switching the transport has fixed that exact "cannot convert string to buffer metamask" error for me more than once.
Ledger devices can expose addresses using different derivation paths. MetaMask will list accounts based on the chosen path.
This resolves the "no accounts found" issue more than you’d expect.
If none of these work, capture logs (see below) before escalating to support.
| Error message | Likely cause | Quick fix |
|---|---|---|
| cannot convert string to buffer metamask | Bridge/transport returns unexpected data format | Update MetaMask + Ledger Live; switch transport (Ledger Live ⇄ WebHID); restart apps |
| Ledger device not found / permission denied | USB/driver or device claimed by another app | Close Ledger Live if using direct mode; try different port/cable |
| No addresses found when connecting | Wrong derivation path | Select Ledger Live or Legacy path in connection dialog |
| Transaction fails to sign / stuck on device | Ethereum app not open or contract signing not enabled | Open Ethereum app; follow on-device prompts (do not enable risky options unless you understand them) |
| TransportError / timeout | Unstable USB or browser HID issue | Use a different browser; avoid USB hubs; restart device |
If you're comfortable digging deeper:
(If you don’t want to debug yourself, copy these notes when you contact support.)
Who should read this: people using a hardware device with MetaMask to sign DeFi transactions, swaps, or dApp interactions who hit connection or signing errors. I use this setup daily to interact with DEXs and staking interfaces.
Who should look elsewhere: if the hardware device has repeated firmware faults or hardware-level USB failures, you’ll want a hardware-specialist channel (or see ledger-and-hardware and ledger-setup for setup/repair steps). If you prefer purely mobile flows, check guides on MetaMask mobile vs desktop or use WalletConnect-compatible wallets per our walletconnect-guide.
Q: Is it safe to connect a hardware device to MetaMask?
A: Yes — when used correctly the private keys never leave the hardware device. Always confirm transactions on the device screen, and never share your seed phrase.
Q: I see "cannot convert string to buffer metamask" — what now?
A: Start by updating MetaMask and Ledger Live, open the Ethereum app on your device, and switch the transport method. If that fails, try a different browser and cable.
Q: How do I revoke token approvals if a bridge error blocks me?
A: You can revoke approvals from MetaMask once devices connect (or use a separate software wallet temporarily). See revoke-approvals for tools and steps.
Q: What happens if I lose my phone or device during troubleshooting?
A: Your funds are safe as long as your seed phrase and private keys are secure. See lost-phone and seed-phrase-backup for recovery steps.
Bridge issues are frustrating but usually fixable with a methodical approach: update, switch transport, check USB/OS, and confirm the correct account derivation path. I’ve walked through these steps after real failures (including that cryptic "cannot convert string to buffer metamask" error), and switching to a different transport or browser resolved it more often than I expected.
If you still see "ledger live metamask bridge not working" after trying everything above, collect logs and check related guides: ledger-troubleshooting, restore-ledger-in-metamask, and metamask-extension-troubleshooting. Need help with swaps after you reconnect? See how-to-swap and swap-troubleshooting.
Safe signing, and always double-check on-device prompts before approving transactions.