# Subject / Issue: LNDhub on Umbrel fails to send payments with LND 0.21.x (gRPC UNIMPLEMENTED: unknown method SendPayment)

**URL:** <https://community.umbrel.com/t/subject-issue-lndhub-on-umbrel-fails-to-send-payments-with-lnd-0-21-x-grpc-unimplemented-unknown-method-sendpayment/25495>\
**Category:** Support and Troubleshooting\
**Created:** [September 19, 2026, 10:09pm UTC](https://community.umbrel.com/t/subject-issue-lndhub-on-umbrel-fails-to-send-payments-with-lnd-0-21-x-grpc-unimplemented-unknown-method-sendpayment/25495 "2026-09-19T22:09:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Tiger](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.umbrel.com/tiger/32/6762_2.png) [@Tiger](https://community.umbrel.com/u/Tiger)\
**Post date:** [September 19, 2026, 10:09pm UTC](https://community.umbrel.com/t/subject-issue-lndhub-on-umbrel-fails-to-send-payments-with-lnd-0-21-x-grpc-unimplemented-unknown-method-sendpayment/25495/1 "2026-09-19T22:09:58Z")

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Hi everyone,

I encountered an issue with the **LNDhub** app on Umbrel when trying to send a Lightning payment from BlueWallet connected to my node.

### Description

- **Receiving payments works fine** (`/addinvoice`).

- **Sending payments consistently fails** with `Payment in transition` / `aborted` in BlueWallet, and no payment attempt reaches LND.

### Error Logs

Inspecting the LNDhub container logs (`lndhub@1.4.1`) reveals that LNDhub is still attempting to call the legacy gRPC method `SendPayment`, which has been deprecated and removed in recent LND releases:

`info: [/payinvoice] : ["e39e6f0b-0ee9-4e86-ac52-a4e8433b7880","userBalance: 2600","num_satoshis: 2300"]`  
`Error: 12 UNIMPLEMENTED: unknown method SendPayment for service lnrpc.Lightning`  
`at Object.callErrorFromStatus (/lndhub/node_modules/@grpc/grpc-js/src/call.ts:81:24)`  
`at Object.onReceiveStatus (/lndhub/node_modules/@grpc/grpc-js/src/client.ts:670:32)`  
`at Object.onReceiveStatus (/lndhub/node_modules/@grpc/grpc-js/src/client-interceptors.ts:389:48)`  
`at /lndhub/node_modules/@grpc/grpc-js/src/call-stream.ts:276:24`  
`at processTicksAndRejections (node:internal/process/task_queues:78:11)`  
`{`  
`code: 12,`  
`details: 'unknown method SendPayment for service lnrpc.Lightning',`  
`metadata: Metadata {`  
`internalRepr: Map(1) { 'content-type' => [Array] },`  
`options: {}`  
`}`  
`}`

### Environment

- **Umbrel LNDhub image version:** `1.4.1`

- **LND Version:** `0.21.3-beta` (commit `572b561bf05f03dfe6135110970c4d858c3482dc`)

- **Client:** BlueWallet (Android)

### Cause & Request

The current LNDhub container package shipped on Umbrel needs to be updated to support the modern router RPC (`routerrpc.SendPaymentV2`) instead of the legacy `lnrpc.Lightning.SendPayment`, which causes the `12 UNIMPLEMENTED` RPC status code on modern LND nodes.

Could you please push an updated build of the LNDhub app to the Umbrel App Store?

Thanks!