I am 99% sure that getting the correct ingenios value depends solely on the IP from which the request to the site is made.
I lost access again, but I was able to log in again on the first attempt using that little known VPN in the USA.
And then I lost access again because I didn't look that ingenios has an expiry date of only a few days. But this time I just changed the value of ingenios from "mystery" to the previous one saved in advance and corrected the expiry date for half a year ahead without using VPN and everything worked. (In the place where I found out this information, it was written that people had been logging into their account for years using the once saved ingenios value.)
It seems to me that it doesn't matter where the account was created from, only the IP from which the attempt is made to log in.
I am sure that all TOR IP's are blacklisted due to too much traffic on the site from one IP. So they are useless now.
The same can be said with confidence about public VPNs from VPNGate and other similar places.
With a fairly high chance, popular and fast paid VPN servers can also be blacklisted due to high traffic to the site from one IP.
It seems logical that little-known servers with low traffic or even a personal private server somewhere in the USA or another country has the maximum chance to log in seamlessly.
But, if you have already saved the necessary value of ingenios and other cookies, then you can log in from the VPN to those blacklisted for logging in and issuing only "mystery", but not completely banned.
It is necessary to save the value of ingenios, ipb_member_id and ipb_pass_hash are automatically filled in when you log in to e-hentai, but you can also save them just in case. When editing cookies, do not forget to correct the expiry date. As I've written before: According to rumors, the value of ingenios can be used for years.