Maybe give Brew Flasher a try and see if that works.
Also on one of my d1 mini wasn't entering flash mode when the usb was connected and I had to short d3/gpio0 to ground
Hope that helps
Nath
I just installed an older brivis ems 20 gas heater and it's great at the old place we were renting we had a bonaire and it was crap and service department wouldent give me pricing for replacement part even though i gave them the fault code
6 KA will be more than enough for domestic use but please don't put delta gear in
go with something reputable like hager or nhp, something sourced from you local electrical wholesaler not from bunnings
i have replaced lots of failing delta gear
Cheers
Nath
Also most domestic leads eg. White ones you buy from bunnings are 0.75mm2 so are more prone to heating up melting the insulation and shorting out under continuous heavy loads
Cheers Nath
All of the engraved lables that you are after are called treffolite (spelling) most trophy / engraving shops will be able to help you out. I know that James from infinity engraving in Canberra does them for our switchboard at work
Cheers
Nath
The ones I have at work are used for the 1Mega watt gen sets, the radiator cooling towers are on the roof so get pumped down to the basement and through the chiller and through the big V18 MTU twin turbo Diesel