In the meanwhile you can ssh to zeroshell and go to the shell prompt (option S)
Then: cd /var/register/system/AutoUpdate/pkgs/
There it should be directory 23321 with the troublesome patch. Rename it to anything lesser than 23320:
mv 23321 23319
Sadly I don’t remember if I erased 23320; I believe I didn’t, but if necessary, you could do
rm -rdf 23320
Then exit the shell prompt and log in via the web interface. Now you can happily reinstall 23320.
Just in case 23321 tries to make a comeback, let’s make a file with the same name.
Go back to the shell prompt and cd /var/register/system/AutoUpdate/pkgs/
Then,
touch 23321
And, to be on the safe side, make it unwritable at least as long as it is not chmodded:
chmod 444 23321
Of course, instead of renaming you could erase 23321. I believe it should work, but I really don’t know.
Hope this helps, it worked for me.