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Instead of manually editing the hex file, you can take the sources and compile them after defining the LVP preprocessor macro. Thanks, that's certainly a lot cleaner :) I've also tried an upgrade via. otmonitor, and this also seems to work fine, with the PIC still configured for LVP. This may not b...

I was too cheap to buy a PIC programmer which I'd likely never use again, and https://wiki.kewl.org/dokuwiki/projects:pickle suggests it's capable of low-voltage programming with an FT232 USB serial adapter which I already have plenty of. Admittedly I'm yet to try my OTGW with the boiler/thermostat ...