FIrst of all i wanna tell you the cause of this error,it just because of firmware,so we have to flash phone for fix it.
so here is guide how to flash your C8511.
Download Flash Data From Here
Step 1. A MICRO SD card of 256MB or more should be available. The MICRO SD card made by Sandisk, Kingstone, or Kingmax is recommended.
Step 2. Format the MICRO SD card (This operation is optional).
Step 3. Unzip the package HCC8511012V100R001C96B638.zip (right click your mouse and select ‘Extract here’).
Step 4. Obtain the unzipped file (subdirectory: \dload\*.*) to be upgraded
Step 5. Copy the entire dload folder (with UPDATA.APP in it) to the root directory of the MICRO SD card.
Step 6. Make sure your handset is power off. Insert the MICRO SD card into the handset. Pressing the VOLUME DOWN key and VOLUME UP key, and then press the POWER key to power on the phone and enter the Software Upgrade
Step 7. When the progress bar stop, the phone will restart, if not you need to remove the battery manually
Ok now flashing complete here,open dc-unlock select huawei phones and connect phone,please read manual here how to connect c8511
do detect phone and as phone detect do unlock
Phone is now Unlocked enjoy.
Please do not send pm if you get any problem contact me at sonork:100.1592878
so here is guide how to flash your C8511.
Download Flash Data From Here
Step 1. A MICRO SD card of 256MB or more should be available. The MICRO SD card made by Sandisk, Kingstone, or Kingmax is recommended.
Step 2. Format the MICRO SD card (This operation is optional).
Step 3. Unzip the package HCC8511012V100R001C96B638.zip (right click your mouse and select ‘Extract here’).
Step 4. Obtain the unzipped file (subdirectory: \dload\*.*) to be upgraded
Step 5. Copy the entire dload folder (with UPDATA.APP in it) to the root directory of the MICRO SD card.
Step 6. Make sure your handset is power off. Insert the MICRO SD card into the handset. Pressing the VOLUME DOWN key and VOLUME UP key, and then press the POWER key to power on the phone and enter the Software Upgrade
Step 7. When the progress bar stop, the phone will restart, if not you need to remove the battery manually
Ok now flashing complete here,open dc-unlock select huawei phones and connect phone,please read manual here how to connect c8511
do detect phone and as phone detect do unlock

Phone is now Unlocked enjoy.
Please do not send pm if you get any problem contact me at sonork:100.1592878
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