Why won't my TBS1000B series scope accept the 3.25 firmware update?

Why won't my TBS1000B series scope accept the 3.25 firmware update?

It may be that the file name is incorrect.  If the downloaded file name has a "_1" or "_3" at the end of the file, please rename the file name without those values and try again. The filename should be "TBS1KB.TEK".