If its a packaged workbook replace the image in the Image folder of Temp files. Click on the current image then right click and select pick image it will tell you the location of the image in Temp folder. Else if its no package then replace the image at the source and the image should be updated automatically in all dashboards.
Thanks for your quick response.
If it is content, is there any way to change????
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For floating text need to replace manually.
Design your dashboard floating content from Data it will be easy.
For Ex Title . Footer ,Header etc..
You can do one small hack..
Open twb file in notepad++ or some other editor ,use content replace...