I think you will have to use this method
https://github.com/lightninglabs/chantools/blob/master/doc/zombierecovery.md
Discussion
I managed to force close the channel from my node, but I could never get the Blixt wallet back online and the funds are stuck in a timelock address. No clue how to sweep.
if the channels are already closed, you just have to restore the seed into blixt and the sweep will be started
Ok thanks I will try again. This was about a year ago and I was unable to even seen the funds before. Is this a newer feature?
If you have only funds in onchain wallet without any channels open / pending to close, then you can use this procedure to import the wallet into Sparrow
Here I just wrote another quick guide with "tips and tricks" about Blixt.
I hope will be helpful for you.
It seems I get stuck at 100% sync but is never fully finishes. These are funds that haven’t been swept because of a force close.
check the lnd logs. Will always tell you what is going on
Is there any sensitive data in the logs? I don’t see it throwing anything major, but I have quite limited knowledge.
When I try to rescan wallet it just says blixt needs to restart, even if I totally close the app on my phone
not really, just look for errors about syncing blocks and rescan addresses