Problem while flashing code via uart in programmer in stm H753ZI

[Abhiram_NP]

while programming the stm32h753ZI board via uart through stm32 programmer ide im getting this error , 
"Error: Activating device: KO. Please, verify the boot mode
configuration and check the serial port configuration.
Reset your device then try again ..." 

but ive looked into the memory bootmode config and connected the boot0 pin to 3v3 (pin 5-7 in CN11) 
if there is any suggetions to solve this please let me know.

[Aziz BRIGUI]

Hi ​@Abhiram_NP,

Can you connect via ST-Link and see the CPU register values ?

Aziz

[Abhiram_NP]

ive programmed it via usb and st link , usb programming making it into bootmode by connecting boot0 and 3v3 and it worked , stlink works too but when trying via uart im receiving this output. 
"Error: Activating device: KO. Please, verify the boot mode
configuration and check the serial port configuration.
Reset your device then try again ..." 
i tried it in a l series board as well same error popped up.

[Aziz BRIGUI]

Are you powering the chip via USB? try another power source. It might be that bootloader is detecting the USB and only initializing that interface. Also verify your HW connections.

Aziz