Time_out error

[pompy001]

When i trying to upload the code to the pixhawk this timeout error is coming. Anyone can help me in this !

Loaded firmware for 9,0, size: 1488689 bytes, waiting for the bootloader... If the board does not respond within 1-2 seconds, unplug and re-plug the USB connector. Found board 9,0 bootloader rev 5 on COM4 ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff type: ÿÿÿÿ idtype: =FF vid: ffffffff pid: ffffffff coa: //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////8=

sn: 002d00433337510d31303337 chip: 20016419 family: STM32F42x revision: 3 flash 2080768

Erase : [====================] 100.0% Program: [====================] 100.0% Verify : [ ] 1.0% ERROR: timeout waiting for data (4 bytes)

[SheldonSEU]

Did u solve the problem? What's the solution?