[求助] C2Prog 烧写 TMS320f28035 过程中出现的问题

*** PLEASE RESET TARGET IN SCI BOOT-LOADER MODE ***
Connecting with target (autobaud)...  OK.
Bootloading...  OK.
Please wait...
Connecting with target...
-Chip ID: 0xBB
-Chip Rev: 0x01
OK.
Unlocking target...  failed (wrong key)!

换了块板子烧写发现同样的问题？

烧写过程中也出现一次下面的情况
*** PLEASE RESET TARGET IN SCI BOOT-LOADER MODE ***
Connecting with target (autobaud)...  OK.
Bootloading...  OK.
Please wait...
Connecting with target...
-Chip ID: 0xBB
-Chip Rev: 0x01
OK.
Unlocking target...  OK.
Loading...  OK.
Connecting with target...
-Flash API version: 100
OK.
擦除不了

但是均不成功
恳请看到的大大指点一下