Disable or remove DND Button on Screen of VP530

[amit_nsec]

Dear
i am new in forum and a new user of Yealink and Working with ,
IP Video Phone : VP530.
Firmware Version :23.70.0.40
Hardware Version :23.5.1.201.18.0.8
I have facing the some problems and wanting to disable the DND button on display.
i am trying to upload directly the configuration file to the phone.
I run the CfgGenerator - CGT2.0.0.11
select vp530 > advance configuration > select features > add
features.dnd.allow = 0
and save the file named, "y000000000023.cfg" .
but when i tried to upload that cfg file to the phone by web browser > Phone > configuration > Export / Import Config > choose file > then click on Import . but it replied "Invalid file name" . i also tried with "0015653D561E.cfg" (MAC ADD) but the result was same.
Am i doing the wrong ? Can you help me out ?
thanks in advance
- Amit