Troubleshooting Tuya PCI-E Card WiFi Connection and Firmware Reflash Steps

Hi guys. I've been using a PCI-E card switch for a PC from Tuya for some time. At some point, it stopped connecting to WiFi. I can't reconfigure it, after a reset, the application sees it, but refuses to connect. I tried rebooting the router, the board, the phone - nothing helps.
I thought, maybe I can reflash it? Read the firmware from CBU, save the keys to the cloud (I don't really understand this, but there are probably some tokens that connect it to the Tuya servers) and reflash it.
I'm not very experienced in this, so I would be very grateful if you show me where to start.

If there is something wrong with the firmware taking a backup could mean someone else could burn it to a test device to see if it pairs I guess.

The CBU uses BK7231N chip so: https://www.elektroda.com/rtvforum/topic3951016.html

There are many guides here for various chips https://www.youtube.com/@elektrodacom

Also you could search the device list for other device with CBUs to see how other users have backed-up their firmwares.

Your device has a TuyaMCU (circled), so RX/TX communications between that and the CBU may get in the way of backup



Do you have an external 3.3v power source and a USB-TTL adaptor?

>>21390398 >>21390398 yes, I have flipper zero and regular ttl programmer CP2102

can I solder directly to the cbu?
for example, unsolder it, supply power, connect to tx/rx and make a backup?

chuvachok740 wrote:

can I solder directly to the cbu?
for example, unsolder it, supply power, connect to tx/rx and make a backup?

yes.

Added after 2 [minutes]:

or solder in-situ first in case you're lucky and the TuyaMCU comms don't get in the way