Wow wow!!!
It worked. I can boot in one go after a cold switch on! Thanks a million Mat.

Last thing: 500000, corresponds to what 5s? 10s? Have you tried a little smaller? The boot is much longer now, but that's a small price to pay to be able to dodge the reset button (which on my case is a nightmare needle pin tiny one to reach)

Cheerio,
Happy JBB!!! :)))