It did work once correctly and download the current database. But subsequent request for update encounters the same error message as before,...
I didn't get a chance to implement your solution. Having renamed sbinfo.dtb, sbdatabase.dtb, and ckdatabase.dtb, I reinstalled. Works fine....
I have seen suggestions on this topic refer me to sites with the .dtb suffix. Apparently the machine code has been rendered as text. I don't know...
Separate names with a comma.