You should post this topic in the Altcoin Mining section, RandomX has nothing to do with BTC and SHA256.
I didn't find any mention to RandomX in your first link?
I only looked very briefly, maybe I'm wrong but I don't want to waste my time to be honest, I appreciate any form of reverse engineering but when it comes to RandomX it's still a big waste of time so far.
In my opinion you can't start with an ASIC SHA256 and make it mine RandomX which is ASIC-resistant as well.
A few years ago I was in contact with a guy from Russia. He was sending videos to all his contacts to show that he managed to mine RandomX with an Antminer X3 with a really impressive hashrate. He claimed to have modified the firmware, and show workers pages with crazy hashrate on MoneroOcean pool.
The reality was that it was a fake, that the guy was just editing videos and never made it. I think in real life he never really tried to be honest.
He disappeared overnight and then we found out from a third party that this guy was just using a huge amount of botnets, and he was trying to sell his so-called "custom firmware" for Antminer X3 to inexperienced newbies.
That's the whole point of RandomX, to be ASIC resistant, and if a flaw had been found, I think we'd all know about it.
PS : Goodluck to try to give motivation to developpers with a Bounty you don't even give the amount
Did anyone ever manage to get the X3 to mine cryptonight variants? CNv2 there was a similar video on YouTube showing something similar with the X3 mining XMR after it had changed algos before randomX
I imagine it was also fake?