oh, I thought it was a PS5 homebrew (running on the console).
So, it's a PC app.
by "generator" I thought it used mathematical computing to generate the URL's hash based on the FW version number, but it's just a list of previous URL put together.
https://github.com/halolck/Ps5UpdatorGenerator/blob/main/Data
4.50:
https://pc.ps5.update.playstation.net/update/ps5/official/tJMRE80IbXnE9YuG0jzTXgKEjIMoabr6/image/2021_1117/sys_5a9888a72c3f34cf831dfe24671afe7868db8e17c38172d12e095d81436b1851/PS5UPDATE.PUP
Well, it's nice that someone kept track of all previous URLs.
Though, it's the "update" URL, it would be nice to also have the option for restore URL.
I kept only 2 if you want them:
RECOVER
Code:
2020_1106 http://deu01.ps5.update.playstation.net/update/ps5/official/tJMRE80IbXnE9YuG0jzTXgKEjIMoabr6/image/2020_1106/rec_ab1645473541b1938660f43252c88144ae1eeba643de16736ad0ed0b1d2bff62/PS5UPDATE.PUP
2020_1204 http://deu01.ps5.update.playstation.net/update/ps5/official/tJMRE80IbXnE9YuG0jzTXgKEjIMoabr6/image/2020_1204/rec_08da8f8f7c3e8e7d5b46a48574e3dc03c3378cc7e89afb540def4b11497d0562/PS5UPDATE.PUP
edit: seems they changed the URL, from deu01. to pc.
I know they all can be found "elsewhere"

but it's nice to have link from official servers.