Hello, just to let you know that today 21-Dec, I experienced the same situation, the machine got stuck while sewing a button hole and the cloth got inside the stitch plate; the needle did not brake; I proceeded to remove all the excess of thread and left the stitch plate clear, then I pushed the buttons to raise the presser foot and the needle but none of them responded; I turned off the machine and I got the following message: error #1010 Maindrive sync failed! Restart machine; I restarted the machine several times unsuccessfully and got the error message every time the machine was on.
Solution: After reading the troubleshoot section, it talks about the hook or bobbin as possible causes. I found the hook was misaligned, I removed it and after placing it back properly and restart the machine, everything is working fine. I hope this can be useful for the community.