Watch the video I made of the process of updating the firmware in this McHF clone.
This process is relatively straightforward and can be completed in about 15 minutes. As with any firmware update, there is some risk of damaging your device and this is obviously done at your own risk.
I followed the instructions shown in the following video https://youtu.be/MXfTxMnCoGE and the results were good. I am back up and running!