The main menu display problem c2305

I love that image problem is a model c2305
Flash was the perfect model, but when the page was black like the most
All cases were true
Even dropdown menu above were active but does not display the original image
I thank you for your help.

HTC Desire 820S "Main Bootloader Problem"

hey friends
i am using htc desire 820S. its working well and booting to the installed android version but when i tried to ge to the boot menu it appears
""NO Command",, i can't boot to fastboot mode and others options. but when i pressed the vol up button i get into "android System recovery"
i want to unlock the boot-loader form htcdev.com for this fastboot is necessary...

plzzz somebody help me with this.. i m waiting..