Sounds like the phone OS is shot. You can go and check the very first post in to 8700 forum for the latest phone OS for your device and download that and then follow the instructions on how to upgrade your phone.
I just expirience it today when I made upgrade to my mate
Download the latest os.
Earse the vandor xml
And then go to app loader not to the DM and choose the port its will write there com1 but you can choose and you will find there your pin number and do the upload