Problem with Generic bootloader pc13 for stm32f103cbt6

[dv51120et]

Hi I originally designed boards for stm32f103c8t6 which they worked with it but I can't get hold of the c8 model. I found a couple of cb models. When I burn the generic 2.0 pc13 bootloader to it the bootloader works but once a sketch is uploaded the sketch is not written to the flash(sketch works but when reset sketch is not run and the state of the led is the same as the initial bootloader without sketch). I have created a const char* and searched for it in the flash. And I want able to find the string. Any help is really appreciated.

Thanks in advance

Edit I have selected the CB model from the arduino ide.

[RogerClark]

Make sure the Boot1 pin is not floating or pulled high, as this causes the bootloader to hold in DFU mode until an upload is received from the PC

[dv51120et]

Both Boot 1 and Boot 0 pins are tied to ground through a dip switch. The board worked with the C8 .