Trying to run wallet backup, I always get the error Protocol message contained invalid tag (zero)

While connecting to btc mainnet
On multiple devices I get this error when replacing BISQ_BTC.wallet with my BACKUP file and delete spv chain before restart.

My coins are locked up because of this error.

As explained in your last post, replacing the wallet file is NOT a great idea unless no other fix has worked. These wallet files are very susceptible to corruption if not handled correctly.

Here’s how you should proceed with restoring your data.

Also please update to 1.5.1 hotfix which was release today