Can you clarify exactly what hardware you have?
I thought we were talking about a “homebrew emonpi” but now you are talking about a “RFM69Pi” I’m not sure what we have here.
You must use the correct “update emonpi” or “update emonbase” button, which one depends on 2 things, what hardware you actually have and whether you want that to be over written or not.
See Update EmonPi Button or Update EmonBase Button?
The logs you provide do not show anything to confirm success or failure of the FW upload, I believe these error might land in another log file called /var/log/service-runner.log if there are any errors, but I cannot be 100% sure.
See Errors not reported in emonpiupdate.log file
If this is a RFM69Pi or indeed an uncased emonPi can you tell us what’s going on with the on-board LED as that may give us some clues to.
Does this homebrew device have a 6pin FTDI header to connect a serial usb programmer? How did you install the original bootloader and sketch? What did you install?