ERROR: TSS request failed (status=94, message=This device isn't eligible for the requested build.)

[DaBlincx]

I'm trying to "update" an iPhone 12 currently on 18.1 to 18.1 because it is boot-looping. iTunes just gave some error 2003 so I tried idevicerestore. It fails with this error:

Request URL set to https://gs.apple.com/TSS/controller?action=2
TSS server returned: STATUS=94&MESSAGE=This device isn't eligible for the requested build.
ERROR: TSS request failed (status=94, message=This device isn't eligible for the requested build.)
Sending TSS request attempt 1... ERROR: Unable to send TSS request
ERROR: Unable to get SHSH blobs for this device

This also happens if I manually specify the shsh blob for 18.1 which i saved using blobsaver.

I read in issue #615 that there was an issue with libtatsu and it has been fixed in 1.0.3, but I'm using 1.0.4 and it's still broken.