U1911 fails to boot.
Press space key to stop auto-boot...
Auto load app flag is clear.
Booting from FLASH...
Starting at 0x400000...
Exc hooked, call reboot.
Exception current instruction address: 0x00400084
Machine Status Register: 0x00000000
Condition Register: 0x28000842
Exception Syndrome Register: 0x08000000
Task: 0x7fffd10 "tRootTask"
1. Check if there has been any upgrade attemt in the past.
Yes - Customer tried to upgrade the device, but the device lost power in the middle of the upgrade, so the upgrade failed. Then it could not boot up again.
2. Try to upgrade the device again using the console cable method. Details can be be found in the Upgrade guide.
After the serial upgrade, issue was solved.
Suggestion: Before starting to upgrade, check the type of the SCU board from the console output, if it is SCU or SCUB. You will have to modify the switch.dat file to upload the correct file (either scu.bin or scub.bin).