Quote from: miner0069 on Today at 03:36:50 AM

I get driver-btm-api.c:1056:check_asic_number: Chain 0 only find 48 asic, will power off hash board 0.

This sounds like a detection problem with the ASIC chips on one of ur hashboards. Ofc there are a few indicators which can cause the problems but as u already mentioned I would start to switch the cables and check the connectors to the control board aswell.
Be careful: Overvoltage can and will damage electronic parts on the long run. If you are facing it again, I highly recommend to check if the psu is working correctly. Might swap that aswell.

So if I am right you tried these options to upgrade ur firmware, right?

Web Interface
SD card
Awesome Miner Tool

If you are trying to upgrade via Web Interface due to signature error it just means that you are trying to install an unofficial version. It might be the case that its not signed correctly, so where did you find that?

The SD card option could be the same problem. If you have the wrong version/firmware it cannot work.
Make sure that you follow the Bitmain firmware upgrade guide (You can find it here: https://support.bitmain.com/hc/en-us/articles/360013786654-How-to-reload-or-upgrade-firmware-)

For the Awesome Miner Tool I cannot speak for myself because I have zero experience with it but I found this on their website:

Quote from: Awesome Miner Tool FAQs

Firmware installation failed - missing signature
Most of the recent firmware from Bitmain have a signature lock that will prevent custom firmware from being installed. When installing the Awesome Miner firmware via the Antminer web interface the result may be an error message about missing signature for the firmware.
Awesome Miner can be used to install Antminer firmware and in many cases bypass the issues related to the signature lock on the Antminer.

To install the firmware via Awesome Miner, go to the toolbar: Tools -> ASIC Tools -> Update firmware. The firmware can be selected from a list and Awesome Miner will automatically download and install the firmware on all selected miners.

Awesome Miner can bypass the Antminer signature check on most Antminers with the following exceptions:

Antminer S9, L3+: Bitmain firmware from July 2019 or later
Antminer S17, T17: Bitmain firmware from December 2019 or later

To install the firmware on any of the Bitmain firmware listed above, an SD card must be used. SD card images can be downloaded from the Awesome Miner Antminer firmware page.