DFU failed

[Milk]

When I send the command to the 51822,so the 51822 ready to DFU,but wait for a long time,51822 is staying at a DFU state,that means 51822 can not work.How to solve this problem?

[Milk]

Hi Hung Bui, DFU app is developped by our company,the device is 51822.DFU app is based on the code of Master Control Pannel.I test it by lightblue.Yesterday,I seek something from Internet.I found that if the device stayed the bootloader all the time instead of entering the application,it means the application corrupted.So I still do not understand,why does the application corrupt?