To do this power off your miner then on wait for 2 minutes while antminer running then hold the reset button for 5 seconds then release it should be reset to factory default and auto restart your miner. .
and check if you can access or login into your antminer dashboard if not..
The only way that i know it could help is to reflash it with new firmware via sd card..
You can download the s9 firmware here https://shop.bitmain.com/support.htm?pid=00720161126080548570Q2tDBXAH065D
Then follow the method below.. If the link for image tool not work you can use this link https://shop.bitmain.com/support.htm?pid=007201604120945219855QObfk20066C
Image tool can be downloaded in https://cnshop.bitmain.com/support.htm?pid=007201604120945219855QObfk20066C
Image file can be downloaded in https://cnshop.bitmain.com/support.htm?pid=00720160119094333656o605qB400623
4G capacity SD card (SD card used in a phone), a Cato or card reader; SD card is as shown below:
1. Insert SD card into your computer, extract SD card tool file and open pn.exe file.
2. Right click on the SD card space and delete the partition as shown below:
3. Confirmation window pops up, enter "new volume" and press yes.
4. Again right click on the SD card part, and choose "create partition".
5. Choose NTFS from the pop up window and click yes.
6. Press the Application from the Partition manager window.
7. SD card partition software will start the application and when finished, click "Close", Click Close to complete SD card partition.
8. Now open Win32DiskImager file to write image file.
9. Browse the image file and click "Write". Click "yes" in the pop up window to continue.
10. When it is completed, click ok.
11. SD card shows around 50MB in its capacity.
Hope this can replace your corrupted firmware..