can I send UART-bootloader commands through non-remapped pins for STM32?

[hkhal]

I am using ESP8266 to flash STM32F107 and TX/RX of esp is connected to PA3/PA2 but On chip bootloader receives commands from PD5/PD6 so can i use PA3/PA2 to flash STM ?

[Tesla DeLorean]

Signs point to no.

With your own loader, in the first sectors of FLASH, you can code it to do anything you want. ​