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After struggling for a while I managed to find the simplest way to flash the firmware on the Wifi Board

I used a Wroom 32 Aleiexpress Board and works like a charm

You need to use the espressit flash tool:

https://dl.espressif.com/public/flash_download_tool.zip

You will need to download 3 files from Openevse Gittub:

bootloader.bin

partitions.bin

openevse_wifi_v1.bin

You can use ANY version ( you can upgrade later), I've used this ones:

https://github.com/OpenEVSE/openevse_esp32_firmware/releases?page=2

under Assets:

To Flash, you need to tell the Applicaition the addresses of those images:

bootloader.bin 0x1000

partitions.bin 0x8000

openevse_wifi_v1.bin 0x10000

Open the flasher app, select ESP32, click OK:

Using the 3 dots, selct the files as below, once all is green, click on Start Button at the botom, don't forget to select the right COM port, and speed:

After it finishes, just log into the new "openevse XXX" wifi access point ( password: openevse), open the 192.168.4.1 web page and you can join your own Wifi LAN

Once the web page is accesible, you can download the last bin file ( currently 5.1.5) and upgrade the firmware to that version:

If you have a backup file form a working node, you can alse restore that one

Enjoy!

You're a legend!  Thanks so much for this write-up.

After bricking my original Wifi v1 board, I compiled my own version of OpenEVSE for an ESP-WROOM-32 board from AliExpress.  It was working, but I wasn't confident enough to upgrade it.  And I scuttled my build environment when I replaced my laptop a year or more back.  

But I had a second WROOM-32 board lying around and tried your instructions.  BAM!  Worked first time, and I'm back on the latest release.  This really should make its way into the how-tos for OpenEVSE as "the way" to replace your Wifi v1 board.

Glad this helped somebody