# Lightning Channel Offline - failed to fetch block hash for height 710764: block not found

**URL:** <https://community.umbrel.com/t/lightning-channel-offline-failed-to-fetch-block-hash-for-height-710764-block-not-found/6142>\
**Category:** Support and Troubleshooting\
**Created:** [February 3, 2022, 4:46pm UTC](https://community.umbrel.com/t/lightning-channel-offline-failed-to-fetch-block-hash-for-height-710764-block-not-found/6142 "2022-02-03T16:46:17Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![phlippie](https://avatars.discourse-cdn.com/v4/letter/p/e36b37/32.png) [@phlippie](https://community.umbrel.com/u/phlippie)\
**Post date:** [February 16, 2022, 1:08pm UTC](https://community.umbrel.com/t/lightning-channel-offline-failed-to-fetch-block-hash-for-height-710764-block-not-found/6142/6 "2022-02-16T13:08:57Z")

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Did you try to re-flash the mSD card?

> [@Umbrel Troubleshooting Guide](http://community.umbrel.com/t/umbrel-troubleshooting-guide/3632):
>
> Edit by moderators The new, official troubleshooting guide can be found here: Huge thanks to DarthCoin for writing and maintaining the previous community version of the guide.

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