That means is rescanning the UTXOs. Look into settings - lnd logs
Force closing take more time than usual. Be patient
You can contact Hampus in Blixt telegram group. Heâs very helpful if you have issues.
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Blixt method ist very good. I have all my coins back now.
Notice:
Enable tor to close the tor channels!
When the recovery process is completed, rescan the Wallet/Blockchain. Settings/Debug/Rescan Wallet.
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@DarthCoin
Do you think the âfailed to fetch block hash problemâ could have been solved with a rescan of the wallet UTXOs?
Like you described in the troubleshooting guide:
Step 1 - Enter using SSH into your node:
Step 2 - execute the following command to rescan walletâs UTXOs:
sed -i âs/[Application Options]/[Application Options]\nreset-wallet-transactions=true/g;â ~/umbrel/lnd/lnd.conf && sudo reboot
Step 3 - Wait some time so LND can rescan all walletâs UTXOs. If it solve the issue, run this to stop it from rescanning on a future restart:
sed -i âs/reset-wallet-transactions=true//g;â ~/umbrel/lnd/lnd.conf && sudo reboot
Wait, it can take quite a while.
Maybe, but if is a physical corruption of the drive blocks (not btc blocks) is better a re-format, a rescan doesnât do shit.
The rescan of the wallet played out. lnd is working now.
The error message âpanic: unable to synchronize walletâ is gone und umbrel is doing his job.
I could have saved my channels. 
@solution21
Maybe you can fix your umbrel without SCB.