MM7DBT Codeplug Editor

Can't write to my radio. The directions given (hold down PF1 or PF2 while turning the power on) do not work to put the radio in DFU mode. How do I get the DB40-D into DFU mode?
The MM7DBT editor is able to read the radio.

Can anyone help?

Got the answer from Radioddity support.
To get in the DFU mode on the DB40-D you hold down the upper right programmable button (the one that looks like a horizontal telephone handset) and press the power button at the same time