Is there a way to restore the CH552T firmware to the original?

Question

Is there a way to restore the CH552T firmware to the original?

Closed this issue 2 years ago · 3 comments

I could not dump the original CH552T firmware which mimics the FTDI F2232H. I am worried about changing the firmware and not being able to reconfigure the tang nano FPGA in the future. Do you have the original firmware, or is there a method to program the tang nano FPGA with the new serial port firmware?
Thank you for any assistance.

Answer 1 · 2022-04-06T01:52:46.000Z

I was able to build the new firmware with both serial port and ft2232 emulation.
https://github.com/diodep/ch55x_jtag

Answer 2 · 2022-04-08T17:29:22.000Z

I needed to connect a 22k Ohm resistor from the Tang Nano's 3.3V pin to the USB D+ line when using the WCHISPTool. No need to use the FTDI software as the CH552 is already in DFU mode.

Answer 3 · 2022-04-09T01:17:29.000Z

Sorry for the late reply. I am glad to hear that you have resolved the issue.