I came across similar roadblocks to you, but I eventually got past them. I am not sure if the problem for me occurred when I maybe entered in an incorrect Access Point/Password, but I could not get it on my LAN.
After many, many reset attempts I believe I managed to reset it to factory, then I was surprised that I could use EWELink and set it up on my LAN. After I had done this, everything fell in place. (In order to get it back to Ewelink mode I held down the button for 5 seconds. I might have done this twice in a row. I don’t know but I do know it took a lot of fiddling and attempts. One thing I learnt (I think) is that when he device is in “Ewelink mode” it is pingable, but does not open communication properly on port 80 or 8081 - it is possible to connect to it on those ports but not send HTTP requests. Discovering this was another part of my breakthrough.
After this I did another reset and managed to get it into DIY mode. From there I followed instructions from Sonoff Mini R2 Switch flashing Tasmota - iot.formatx.net and it worked.
I was surprised, but ignoring the reset pin on V1 thats not present on V2, the devices must be pretty similar, because I landed up following a V1 youtube instruction to help me work through Ewelink and what was going on.
I hope this post (a) comforts you that you likely have not bricked the device and (b) gives you things to try to get it working. I am aware that, as far as answers go, its not a great one - but as no one else has answered it in 3 months, at least its something - and even if it doesnt help you, it might help someone else.